#help-0
1 messages · Page 232 of 1
yeah
Well i am thinking
wait if you write it as a product of 3 terms
(-1)^n * integral 1 * integral 2
yeah
so if u let x = 1/n, y = n in third identity
u have a double integral
double integral * third identity
bruh that doesnt work
since 1 is not < 1
hmmm
xy = 1 in our case
<@&286206848099549185>
there's an answer here but it is limited for subscribed users
i think this converges to phi
bruh i used another calculator it recognised my input wrong
yeah i got that finally on the calc
?
Nope
do you know anyone who can help?
Ann, MethsIsAlwaysRight,NEONPerseus
can i mention them?
I think so
Fun fact, u can write the double integral as double integral of another sum divided by (-1)^n * x
augh i literally got pinged thrice in three different channels
sorry
$$\sum_{n=1}^{∞} \int_{0}^{1} \int_{0}^{1} \frac { \frac{-xy}{1+xy}}{(-1)^n*x} dxdy$$
Brruh why did everything go to hell
that's kinda strange isnt it
Yeah but its smthing ig
ItzKraken2
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Hi, What is the value of (a-b)/(a+b) when 9^a=2^(1/b), (a+b)^2=6*log2/log3 for both positive numbers a,b?
@near rose Has your question been resolved?
ablog9=log2
ab= log2/log9= log2/2log3
a^2-b^2 = (a+b)^2-4ab = 6log2/log3 - 2log2/log3= 4log2/log3
(a-b)/(a+b)= a^2-b^2/(a+b)^2= 4(log2/log3) / (6 log2/log3)=2/3
wow thank you so much
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can anyone help with this
The question isn’t phrased great but I’m assuming that the % of willing does not include those who are also willing to pay all and most of the fee
I’m guessing it would say at least half for it to include the other data points
I mean it’s clearly not B or D
I’m leaning towards C as it makes sense it just isn’t exactly correct
But it still could be A, it seems to depend on the extremity of exclusion for mistakes in the statement
As I would argue you can infer that it is correct but it should be induction not certainty
@alpine sable Has your question been resolved?
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sorry i have brain damage
it helps when people help me
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Hi, is that true ?
@lunar fog please open your own channel. the other person got here first. #❓how-to-get-help
@glossy hill yes
it's just a^2 b^2 = (ab)^2
?
and a^2 + b^2 = (ab)^2 FALSE ?
a²+b²=a²b² looks right to you?
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Hi, im currently trying to understand the equation for radioactive decay and activity and i came across the word "decay constant". its calculated like that: λ = ln(2) / T1/2. But does someone know, why I have to calculate it with the ln(2)
What kind of answer are you looking for
You want the math derivation?
Or you want to know something else?
yes
Do you know integration, @floral knoll?
nope
Then you won't be able to follow the mathematical derivation.
But here's an overview anyway:
Suppose N is the size of a population of radioactive atoms at a given time t, and dN is the amount by which the population decreases in time dt; then the rate of change is given by the equation dN/dt = −λN, where λ is the decay constant. Integration of this equation yields N = N_0 e^(−λt), where N_0 is the size of an initial population of radioactive atoms at time t = 0.
The half-life, is then given by N(t_half) = N_0/2
Solving this for lambda yields $\lambda = \frac{\ln 2}{t_{\frac12}}$
Suppose $N$ is the size of a population of radioactive atoms at a given time $t$, and $dN$ is the amount by which the population decreases in time $dt$; then the rate of change is given by the equation $\frac{dN}{dt} = −\lambda N$, where $\lambda$ is the decay constant. Integration of this equation yields $N = N_0 e^{-\lambda t}$, where $N_0$ is the size of an initial population of radioactive atoms at time t = 0. The half-life, is then given by $N(t_\frac12) = \frac{N_0}2$. Solving this for lambda yields $\lambda = \frac{\ln 2}{t_{\frac12}}$
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im confused
waris
,tex .sum diff trig
riemann
Second row
thx
you can also figure that sin(x) shifted pi/2 units to the left looks like another curve as well :))
im just forgetting sum diff rules
Cos(90+x)=-sinx
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hello
Ok
this is the ques
Btw there's a physics server in #old-network but still ok
if we do it wrt truck
Amit bijarnia ?
then why do we take velocity towards west and 10-vsin theta
and now towards east. vsintheta-10
lets say we need to study relative motion of b wrt a
then we just take inverse of velo or acclrn of a and add it to b right?
then why didnt we do vsintheta-10 here
ye
lol
how did u recognize
he is such an awesome teacher.. well better than my teacher at fiitjee atleast
but i couldnt understand this concept
I remember handwriting....i learnt relative from him.....the way he explained was just...
yup
can u explain why he took 10-vsin theta
instead of vsin theta - 10
??
Its assuming the truck is moving faster than the boy
he said that to judge a motion of lets say a wrt to b we will take velocity or accln of a and inverse it and add it to velo or acclrn of b
i still cant understand :(
both are equally correct, just take into account the negative at the end
which -ve?????
If you use 10 - Vsin theta, if the boy was getting closer to the truck 10 - Vsin theta would be negative
If you use Vsin theta - 10, if the boy was getting closer to the truck Vsin theta - 10 would be positive
They're both valid, just check whether the end sign makes sense
if we take vsin theta-10.. then to get to the truck the v should be negative.. so vsin theta - 10 would be negative .. shudnt it be?
If vsintheta were greater than 10 then he wud definitely cross?...
Since he's moving rightwards at greater speed
Yes
So it's obviously the other case
Along with vertical component
well isnt that what we want?
to cross?
Ya observer ko rest me karva do
ye kb bola sir ne?
:(
ha rest mei krwaya to
truck ko
Aur uske liye Jo Kiya vo object ko karo
krdiya
Idk bruh i learnt relative 2 yrs ago
to fir vsin theta + 10m/s west hoga na
Mum burnt Mohit sirs notes
where v sin theta is towards east
yes
Also there's vertical comp up
yup
If vsintheta is greater
yes
Then it's quite straightforward
yup
bhai ek baar kya voice call pe aa skte ho? mai kaafi der se ye question soche jaa rha.. it would be easier for me to explain my doubt @gilded magnet
You can (with reference to the start point of the boy) figure out his end point. If the truck passes that endpoint before he reached it, he did not cross.
Mera vocal chords thoda damage hua hai
ohhkkkkk npp
so u mean to say i can solve with vsin theta - 10 too?
The question says 'just crosses the road'
In that case he wudnt 'just cross the road'
Which means he shd die or get hurt if he was an instant late
Like 0.01 sec late
why :(
In first case he wud never die
Not just that
He wud always be at a distance from the truck while having just crossed
s o what else do we want
In case2... increment 10-vsintheta a bit and he dies
yup
So here he wud just cross feeling the truck scratch Lil bit off his dress behind smoothly as he just crosses
'JUST CROSSES'≠'CROSSES'
And immense relief,heartbeat
Btw join the physics server.waha pe petschge hai.petschge Amit sir ka baap hai.
?/?
usse bhi baat kr rha hu abhi
lol
i thought vo foreign ka hai
Ha plasma physics karta hai
o
kk
max planks kya hai
Write the vectors on paper you'll get it
ha its equal
but if they are equal then vsin theta -10 se bhi krne ka kuch to way hoga
But you won't 'just cross' you'll always be 8m away from truck
During motion
yup
acha
truck rest pe hhai
isiliye??
cos vsin theta -10 lene se hum aur dur jayege
and just cross nhu krege
?
Actually motion...par Haan in our last image yes
hum to last imsge ke ref mein kr rhe na
solve
nhi
i m in 11th
u have much more exp
just started my 11th journey
btw is abj sir enough for jee
Bruh i messed up everything
whyy
I'm not explaining here
More than enough
okkk
You can also try nikhil dabai sir for some units
Wlc broski all the best and don't take things too seriously there r soo many colgs lol
i started my jee prep in 10th
dont wanna wastw all the efforts ff
Bits manipal Amrita lpu SRM many more...
Yea ryt but if u feel like ur trapped or ever feel mentally low...u need reminders
well everything is going smooth rn
but chem is such a disgusting subject
yup
Agreed
too much rote learning
and phy ke abhi udhar teacher ache nhi hai
so abj sir se pdh rha
Yea btw u hearda aanand srinivas stayqrious?
yes
Floatheadphysics?
yup
his vids are quite fun to watchh
Edupoint?
nope
Yea actually I'm relearning all the physics now
ahhhh
Starting from motion in straight line
OH damn why tho?
Reached projectile
studying from abj sir???
Academic pressure didn't let me learn stuff from first principles
Now physics is not part of academics as I'm taking btech cse
12th just over
hey btw i have another doubt... when there is no wind and car is moving forward.. then the flag flutters in opposite direcn..but when there is wind and car is moving forward.. we take the velocity of flag same as the velo of car and ins ame direcn
why is that so
u just gave ur jee advanced?
kkk
Mom asking to sleep
okk cyaaaa
Bye broski all the best
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The downfall of proof by algebra? 👀
What is your question
then x isnt 1

Yes
What did I do wrong
I feel like I have made a dumb error and it's staring right at me
wonder where 
That introduces extra solutions when you do so
What?
e.g. take x = -1, squaring both sides would get you that x^2 = 1, and solving that gets you that x = ±1 (a more silly example)
yep
This here already has no solutions (for real choices of x, 4^x is always strictly positive)
,w 4^x=-4
Well
u can rewrite 2 as sqrt4
Knew it had i, thought it would come out from the algebra
¯_(ツ)_/¯
But I did the exact same thing
You squared something that was negative in the first one, which created the solution that didn't exist
But -4² is always 16
yea but u forced it
Bro I know.
u made new solutions
if the base thing is fundamentally wrong, u wont rly go anywhere
But that is how people found out what 4^½ was no? They could've believed that 4^1 = -4 and 4 bc that's what the algebra says
its wrong tho
like 4^x will always be positive
ur forcin ur solution to be a thing, while it isnt correct
plug back in and u see it isnt possible
It shows clearly and arithmetically that 4^1 can equal -4. I know this is wrong but I want to know why, and not bc I'm forcing it bc maths doesn't just do that from what I've seen
If I am "forcing it", then all proof is unreliable, bc I haven't forced anything. I have just done algebra
Gonna go out for a bit, I'll read it if it closes automatically or smth
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someone ples explain the theorems
!help
Please read #❓how-to-get-help
which one specifically?
no i wasnt paying attention
finish this vid and come back
ok
@little ledge
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/math/geometry/hs-geo-circles/hs-geo-inscribed-angles/v/inscribed-and-central-angles
Proving that an inscribed angle is half of a central angle that subtends the same arc. Created by Sal Khan.
Watch the next lesson: https://w...
this might be better
the last one probly doest have a proof
i get it
ok
the required angle can be broken down to these arcs; this should be enough help for u to figure out the answer
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I'll call the inside function g(t), and say its anti-derivative is G(t). Then:
F(x) = G(inf) - G(x)
if u ignore the bounds...
What's the derivative of that equation?
(Where inf is really a lazily applied limit)
But that wouldn't give you what G equals to
Sorry I am back
If I take the derivative of both sides, I get:
F'(x) = -g(x)
= -e^(-x)/x
This is a useful method for taking the derivative of any integral with the variable in the bound
@indigo harbor Has your question been resolved?
Thank you so much
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need help with 2.1.1
Try to write it in a way that decomposes the exponent into easier forms
And successively take those
what
eg. $4^{\frac{2}{3}} = (4^2)^{\frac{1}{3}} = 16^{\frac{1}{3}}$
4th root of 81 cubed
sqrt of 81 twice is 3
3 cubed is 27
fractional powers mean roots, where the denominator is the root
the coefficient is then the integer power, in this case 3.
seymourdavison22
start with this property $\frac{1}{m^{n}}=m^{-n}$
XxMrFancyu2xX
see if you can figure out the rest from there :))
so 1 over the thing = the thing negatively?
then I just do it normally cos it's positive now?
just simplify $81^{\frac{3}{4}}$ like you do normally and keep it in the denominator:))
XxMrFancyu2xX
thank youuu
how is it done again?
use $(a^n)^{m}=a^{n\cdot m}$
XxMrFancyu2xX
@amber tulip Has your question been resolved?
@amber tulip Has your question been resolved?
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Is this how you would do a question like this
If it's an evaluate then yes the process is correct, but you forget to make it -1 + h
All good?
For which part
Part a and b
Yes
Yes it seems so
That's the slope of a secant always.
x = 1.01, into the equation y = x⁴ + 1? Yeah
y1 is x2 = 1.02?
.
For a go through (1.01, y1)
For b go through (0.99, y2)
For c find the mean of these values and use that for x = 1
So is x2 going to be 1.01
Sure
I think so
Why is that exact
Cus the examiners are nice
That's really nice
This is for part B
Find the average of both y and x values ? For part c
I think actually get the gradient of the line though x1 and y1
How?
@wheat isle Has your question been resolved?
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-
How should i find expression for the apparent nth term a_n of the sequence?
3,10,29,66,127.... -
Why following expression is wrong for following sequence?
1,-1,1,-1,1...
My Answer: a_n = -(-1)^n
Actual Answer: a_n = (-1)^n+1
Those answers are equivalent
More compact way of writing it
Essentially its the same as 2*(2)^n
Makes no sense to write it that way
ouch
honestly no, sorry ;P would be great if you can elaborate some more.
In mathemathics we want to write terms in a series as compact as possible
So instead of 2*(2^n)->2^(n+1)
Likewise (-1)*(-1)^n=(-1)^(n+1)
When multiplying two exponentials you add the powers, so $-(-1)^n = (-1) \times (-1)^n =(-1)^1 \times (-1)^n = (-1)^{n+1}$
WeAreIngram
oh god, you are right. can't belive i forgot that rule
thanks, now i understand that.
Great
.close
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For (2)
yes
If the equation has two repeated roots then the discriminant (b^2 - 4ac) is equal to 0
So write out the full discriminant and set it equal to 0
thx
np
how would i get the value of k
Solve that new equation
how
idk how to solve when there is a
power
nvm i got it
thx
np
You also have to consider 2x - 4 = -17
how can i solve this using algebra
thx
You can also square both sides and solve
i just calculated both and got 4
Yay
as sum of both
Nice
Yep
It would take too long to type out on my phone
Basically you use their hint to simplify it to a quadratic over a quadratic = 73/3
Then you expand out those quadratics and multiply up both sides to get to quadratics equal to one another's which you can then combine into one quadratic and then solve
how do i do that
Ask someone who's on pc it would take me a week to type on my phone
ok
.close
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For what values of k will the following equation always be negative?
What's D
Determinant
Is it called that way in english
That thing under the square root in quadratic formula
Where D = b^2 - 4ac, or in this case ->
D = (-2k^2)^2 - 4k(k^3 + k^2 - 3k - 4) = 4k^4 - 4k^4 - 4k^3 + 12k^2 - 16k = -4k^3 + 12k^2 + 16k
So, D = -4k^3 + 12k^2 + 16k
This is discriminant, not determinant
Then, we follow that D < 0:
-4k^3 + 12k^2 + 16k < 0
divide everything by k
-4k^2 + 12k + 16 < 0
divide everything by 4
-k^2 + 3k + 4 < 0
Solve the equation: -k^3 + 3k + 4k = 0 (roots are 4 and -1)
Yeah, that thing. Exchanged them XD
And then, logically, for (-inf, -1) U (4, +inf), the function is negative
And that should be the solution
But it isn't
According to the book
Show the question and answer from the book
It's in Serbian
But here is the image if you want
@tacit arch (in case you are waiting for the ping)
Another observation: k must be negative and D < 0, for this to be always negative
,rotate
I have translated the problem up there, there's nothing more to it
when you divide everything by k, how do you know the inequality sign doesn't change
OOOOOOOH
I don't know
That's a good observation
So that's an illegal move?
Wait wait wait
Let me try and solve now!
you just have to treat k>0 and k<0 separately
Yes!
And
In fact
Only k < 0
Because that's what exercise wants
Like, k = a in this problem, and when D < 0 and a < 0
Then the function is completely negative
Solution found!
Thank you very much @tacit arch !
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Linear Algebra PQ ive been stuck on
does it have something to do with the e_1, e_2, and e_3 vectors?
1
0 = au + bv + cw
0
looking through my notes i cant really find much related to this
or should i put the 4x1 vectors in a system and reduce to ref or rref?

i think it's this
if you stack the three equations together columnwise, you get something of the form TA = B, which you can solve as T = BA^-1
I'm not sure i understand that, sorry
any way you can simplify or reword the explanation?
3 0 2
3 0 0
3 2 2
-1 4 2
```?
like that?
that's B
You just multiply botch sides with the inverse of A
A is ```
0 1 -3
-3 -4 4
-2 -2 1
your three equations together are the same as TA = B
you can start with the augmented matrix [A | I] and row reduce it until you get [I | A^-1]
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I need help
@silver portal when they don't do it for you, labeling sides usually helps.
And putting a variable for the sides you don't know
So a b c and h
yeah I suppose. I'll draw some things and send the picture in a second
let's take this for example
can you tell me what side CD is?
21?
21 is the whole thing
10.5
you don't know if it's split halfway
hint: it's not a number alone, it contains another side
thats the only side cd can be aint it
i'm not sure I get you. But does this make sense to you?
CD = 21 - AD
because the side on the right = whole thing - side on the left
(on the right and left of the dotted line that is)
another way to see it is:
whole thing = left + right
(do - left on both sides)
whole thing - left = right
does this make more sense?
yeah that's the thing, you have to work around that, but I'm getting there
using CD you just found (21-AD), BD, and BC, can you think of a way to solve for AD?
Bc - bd
So 8 and 17
yes
essentially that bigger triangle on the right
a right triangle might I add, might help you see it
Weird question but u know what an isoceles triangle is
two sides have same measures
If those 2 triangles were split the left would be isoceles and the right would be a right triangle
If i solve those like that would i still get the right answer
I'm not sure. Honestly I'm seeing one way, but there probably are more. Here I'll send what I mean, maybe I'm just not clear
with the three sides I drew, you can find AD. and with AD, the question mark side
bleh, I need to leave, very sorry about that, but if you use pythagora's theorem with what I've shown you will be able to do it. I believe in you :)
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With questions like these
Where it requires a phase shift
Would this be considered correct or incorrect
Do I have to complete the curve that appears before pi/2 or no
Because it starts at pi/2
sinusoids do not have any inherent start point
you, however, are asked to graph yours over the interval [0, 2pi]
and right now, you are missing the part from 0 to pi/2
so yes you have to complete that too
sure should...
also I need help with solving tan2(theta)=1
I have a lot of trouble with solving equations over a restriction
so I have tan^-1(1)= 45 degrees for base angle
And tan is pos in Q1,Q3
But the restrictions say [-180,180]
@vale wigeon does this mean Q3 won’t be part of the solution?
i think it's not very helpful to think of quadrants here simply because your equation is tan(2x) = 1
you are best off writing down the general solution, i.e. in degrees, 2x = 45 + 180n
wait, did you mean tan(2θ)=1 or tan^2(θ)=1?
tan2(theta) feels like deliberate ambiguity
@wheat isle?
the first one
What I thought was I can use quadrants and then divide the angles by 2 afterwards
yeah, that approach makes the domain restriction tricky to account for.
that's why i am suggesting a different approach that makes the domain restriction straightforward to deal with.
first solve the equation over all real numbers
then filter out only those solutions that belong to your desired interval
this is deliberate and malicious on your part...
there's no other explanation for why you keep putting parentheses in exactly the wrong places
tan(2theta)
from tan(2theta) = 1, go to 2theta = arctan(1) + 180n
where n ranges over the integers of course
45+180n?
yes
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how do i do this?
@celest stump Has your question been resolved?
<@&286206848099549185>
1048576Prog
OK that's ok
i know you break it down to parametric equations(i think) but idk how to deal with the 3 variables
expand $(0,-1,-2)+k(1,2,3)$
1048576Prog
like $(0,-1,-2)+k(1,2,3)=(\cdot,\cdot,\cdot)$
1048576Prog
simillarly expand $(1,2,0)+m(-1,1,0)+n(0,1,-1)$
1048576Prog
(1-m,2+m+n,-n)
So, (0+k,-1+2k,-2+3k) = (1-m,2+m+n,-n)
right
that is
$$
(k=1-m,-1+2k=2+m,-2+3k=-n)
yeah..
$(1=-m-k,1=m-2k,-2=-n-3k)$
Joshii
1048576Prog
ok
Joshii
$([A]1=m+k,[B]1=m-2k,[C]-2=-n-3k)$
1048576Prog
1048576Prog
for both side of the equation
$0=-3k$
Joshii
$\implies$?
1048576Prog
k=0?
Yeah.
can i sub that in everywhere?
replace $k$ to $0$ for $[A],[B],[C]$.
1048576Prog
$(1=m, 1=m,-2=-n)$
Joshii
ok. so we can solve $(k,m,n)=?$
1048576Prog
$(1,1,2)$
Joshii
just, check it. check if $(0,-1,-2)+k(1,2,3) = (1,2,0)+m(-1,1,0)+n(0,1,-1)$.
1048576Prog
Oh it is just a sketch, maybe some calculation in it is wrong. check it. But you know how to solve multi-variable equation.
Joshii
$(1=k+m,-3=m+n-2k,-2=-n-3k)$
Joshii
Yeah.
you can do anything algebraic
because $P=Q,R=S \implies P \circ R = Q \circ S$
1048576Prog
but now i cant get rid of 2 variables
?
like if i subtract/add i'll be left with 2 variables
i re-did the calculation it should be this instead
$(1=k+m,-3=m+n-2k,-2=-n-3k)$
Joshii
B+C, then?
$(-5=m-5k)$
Joshii
so solve the equation with $[A]$ and $[B]+[C]$.
1048576Prog
Joshii
Joshii
$(6=0+6k)$
Joshii
$k=1$
Joshii
$(k=1,m=0,n=-1)$
Joshii
What's your question again?
@celest stump Has your question been resolved?
I feel like just graphing it would help
Or at least help you see how to figure out how to solve with math
the way @weary widget said to do it is right im just messing up somewhere
@celest stump Has your question been resolved?
@celest stump Has your question been resolved?
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i really dont understand how this happened, why did the + change to - after moving j to the numerator
everyone
The latest definition of time and space
four-dimensional
is achievable
Light distorts space, but time does not, time is like a circle
I do not like China
You can use translation software to translate Chinese
Thanks------
Discovering patterns can make powerful bombs
are you real? @visual stream
You sound like you tried to Google Translate your messages but accidentally translated them back and forth 20 times
but you know the light and time and space very like
Closed by @minor aspen
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yes
I am china people but I don't like my country
hello china people
you can get important thing in the picture
if the time and the space like this picture
what mean ?
all of the science is a wrong,maybe
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four-dimensional can give us a turth
Please don't occupy multiple help channels.
等等
我懂中文
i can have a shot at translating
可以的
好
我不像你这么爱这个国家(中国)
我希望美国将来可以统治世界
我希望有人可以掌握时间
美國與中國也不是很好啦
很空间
科技最好的结果是造福世界
wow
拜拜了
有缘再见
有緣再見

is that a bot
no
檢測到中國玩家
even in chinese he doesnt make sense ?
no haha
idk what you're talking about
no i think he makes sense
yeah
hes just very against china

i suppose he left
why is it in the math channel tho
it started out as math but then like
close or not 
not yet
i offered to discuss with him in chinese cuz like
his native language is probably chinese
but then he said stuff like
nah i dont like china and shit
you know chinses or like you use translator
oh wait you actually thought he's not a bot?
but then it devolved into some political conversation lmao

that was so random
im bilingual native
the thing in my pfp are my chinese exams
reading and writing
dude isnt a bot
hes probably not a bot
no bot speaks like that
no its more like
no bots are allowed to speak like that
or else china's gonna come in do shit
no bot just leaves half way through a conversation 
ahaha true
yeah
sanest chinese citizen
fr
Closed by @keen plinth
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my mind is like a robot
like CHAT GPT
Or CHAT GPT like me?
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do you still need help with science
他們認爲你那種行爲好像預設的bot
asking the real questions here my man
chatGPT bad.
I think chatgpt is like you
What is the CHAT GPT neural network element like?
ran out of hmmges 😔
Closed by @keen plinth
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Free neurons are better than CAHT GPT
inb4 this gets reopened for like another 3 times

i think china chat gpt will rule
you know?

