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#math questions
sage cradle
so this is not a serious problem at all
dense goblet
Yes
sage cradle
so literally the answer can be any number
elfin trail
eternal glade
isnt it 17
frosty nimbus
There one problem
If its x
The next is like
Half of x
U can see it isnt same
symbol
copper snow
not really math per se but do you guys know any apps similar to mathway but its free
severe saffron
calculator and google
copper snow
calculator 😭
i meant like for stuff that simplifies expression and show you steps
mathway is paywall'd and photomath is janky so yeah
dim echo
this is elementary school physics
dense goblet
this is elementary school physics
But would it take off
elfin trail
Blud im learning kuhn tucker now wth
elfin trail
Test it in bad piggies
severe saffron
Theory from a guy that skipped every physics lesson in his life: It will fly off but a little then return back to conveyor belt
frosty nimbus
real?
sage cradle
yes
frosty nimbus
🤯
dense goblet
Real
elfin trail
Amogus
dense goblet
We love among us
frosty nimbus
Slove the f(among us)
elfin trail
Yo
Having SVM, NN, and bayes classification test today
How tf to do support vector machine manually
Blud
I only understand bayes classification
frosty nimbus
77+33=100
frosty nimbus
I only understand bayes classification
Idk what r u talking about
elfin trail
Yo
elfin trail
Having SVM, NN, and bayes classification test today
And today is the final exam for this wtf
dense goblet
GG
frosty nimbus
elfin trail
Yo go math
dense goblet
Laplace
subtle drum
elfin trail
Nobody :
Gauss about to collab with every mathematican and their discovery will be named with "gauss-[insert collaborator]" :
elfin trail
I can understand doing fourier transform for time series function Zt
But what the hell is spectral analysis
My brain is fried rn
So there is spectral thingy
You could transform autocovariance gamma_k with fourier transform
But how tf it connect with spectral thingy my brain is gone
So my class uses wei's book
Ok so Zt = A1cos(pi t/2) + A2sin(pi t/2) ; t = 0, +-1, +-2, ...
A1 and A2 is independent random variables, with mean = 0, var = phi
Find autocov function gamma_k for Zt, and check if gamma_k is absolutely summable, and find spectral distribution function of Zt wth
@math nerds
elfin trail
Yooo
Pls summon math nerds here
Now i have work to use 3 packages in r to do regression using MLP
severe saffron
just google it man
frosty nimbus
elfin trail
Real
bright mesa
ii) is crazy
wintry haven
ii) is crazy
Okay so, correct me if im wrong but all it says is that p' = f' for all x? and we need to find p
ah wait nvm
elfin trail
Update : i just did intervention model in time series 💀
elfin trail
Wake up oi
frosty nimbus
No
dim echo
dim echo
Wake up oi
Here wake up
elfin trail
*gave up at p(x) = erf(...)
erf is gauss error function and i never see it used for CDF 
frosty nimbus
No
elfin trail
erf is gauss error function and i never see it used for CDF <:kyasadhole:9235210...
Or i just forgor
frosty nimbus
Satoko math lover
elfin trail
(a + b)² = a² + b²
Math hack (trust) :
sage cradle
true when characteristic is 2
devout light
(a + b)² = a² + b²
||Isnt this possible with (a-b)²|| if you are a mathematician do not see this you will get a heart attack and most likely a stroke
Actually nvm it is possible with (a-b)(a+b)
sage ivy
hu
Additional Charges:
A fixed meter rental fee of RM 5.00 is applied to all bills.
A sewerage fee, calculated as 70% of the total water consumption charges, is added
to the bill.
??
is it really 37 because i got 42
dim echo
Well... 35 * 1.2 is 42
This looks like an output you'd get from a program, so it doesn't really fit in this thread and I'd ask the question maker if I were you
sage ivy
This looks like an output you'd get from a program, so it doesn't really fit in ...
yea it is a program and im waiting for the answer from my lect
but i just want to know if anyone has any idea
sage ivy
Well... 35 * 1.2 is 42
when i used chatgpt
the calculation goes like for the first 20, 20x0.80, then 10x1.00, then 5x1.20 which in total is 35 but it results in 32 instead
dim echo
Oh
Is this the Malaysian way of calculating tariff
If so then yea it's 20 * 0.8 + 10 * 1 + 5 * 1.2
And it is 32
Then you add 5 as a fixed fee
So you get 37
sage ivy
huh but wouldn't that mean they're charged twice then?
dim echo
huh but wouldn't that mean they're charged twice then?
No
Here's an example, but replace kilowatt per hour with meter cubed
So you pay more as you use more
sage ivy
No
no no i mean the fixed rate part
since total will add up rm 5for meter rental. then add rm 5 as well on the water charges?
sage ivy
huh
dim echo
frosty nimbus
https://youtu.be/tuDACYvlZaY?si=Ca9VSQNhYyXKZTi-
Cirno but smarter
elfin trail
The real math is knowing the lores
frosty nimbus
old halo
How to prove (cscx+cotx+1)/(cscx-cotx+1)=cscx+cotx ty
frosty nimbus
I hate sin cos tan
dim echo
How to prove (cscx+cotx+1)/(cscx-cotx+1)=cscx+cotx ty
If you're confused about the last two, refer to how I converted csc x + cot x into (cos^2 (x/2)) / (sin^2 (x/2))
I do have the handwritten version but my handwriting is kinda ass
dim echo
What did you use?
old halo
uh like i did not use x -> x/2 smth like that
old halo
Oh the double angle identities
ye this one
the rhs does not have x/2 smth like that so i did not think about use double angle identites
dim echo
I thought of it after I realized I needed to get rid of 1
old halo
ty anyways
dim echo
old halo
confused..
elfin trail
"Without solving the equation" 💀
wintry haven
i hope this makes sense 🫡 @old halo
zinc raft
Hm
I wanna try this question too
Nvm idk how to do it
Idt I’ve ever seen a qn like this before bruh
devout light
i hope this makes sense 🫡 <@883358733739102329>
dayum nice writing you got there
wintry haven
dayum nice writing you got there
i tried writing in a discernable writing so they could understand
normally it looks like a mess 
old halo
old halo
i am thinking some dumb question like 1÷1/0=?
will it become 1x0? (1x0/1)
zinc raft
i am thinking some dumb question like 1÷1/0=?
will it become 1x0? (1x0/1)
It will always be cannot be divided
Unless 0 is actually a unit (like x)
You cannot split a pie with no one, you need to give it to someone
old halo
You cannot split a pie with no one, you need to give it to someone
that why I called it dumb question XD
devout light
i am thinking some dumb question like 1÷1/0=?
will it become 1x0? (1x0/1)
it is impossible
old halo
i stuck again
lim x->0 (e^x+e^(4x)-2)/x
(no L’hopital’s rule)
wintry haven
use the -2 to give a -1 to each of the e^xs and seperate and use the standard limit
old halo
use the -2 to give a -1 to each of the e^xs and seperate and use the standard li...
..
how did i didn’t think that
frosty nimbus
i stuck again
lim x->0 (e^x+e^(4x)-2)/x
(no L’hopital’s rule)
What r we learning this for
old halo
i stuck again
lim x->0 (e^(2x)+e^(-2x)-2)/(x^2)
(no L’hopital’s rule)
severe saffron
it will be use to calculate how much braincells all of us lost in math class
old halo
Use Taylor expansion
Your right..
proven gyro
e^(2x)+e^(-2x)=2+4x^2+....
e^(2x)+e^(-2x)-2=4x^2
(e^(2x)+e^(-2x)-2)/X^2=4
@old halo please correct me if I'm wrong
I'm too lazy to do the whole thing
The part before that is just expanding e into Taylor series and combining both
old halo
e^(2x)+e^(-2x)=2+4x^2+....
e^(2x)+e^(-2x)-2=4x^2
(e^(2x)+e^(-2x)-2)/X^2=4
Ur right
old halo
🫶
wintry haven
e^(2x)+e^(-2x)=2+4x^2+....
e^(2x)+e^(-2x)-2=4x^2
(e^(2x)+e^(-2x)-2)/X^2=4
damn this is a very different way of doing this
the answer is correct so iguess it works
wintry haven
yeah you can do it without that or taylor series
proven gyro
How do you do it without lol
The only thing that came up to my mind whenever I see e is just taylor
Or hopitals idk
wintry haven
you can rewrite (e^2x + e^-2x - 2) as (e^2x - 1)^2/e^2x
then use the standard limit
wintry haven
yeah thats why i was surprised it worked XD
proven gyro
zinc raft
i stuck again
lim x->0 (e^(2x)+e^(-2x)-2)/(x^2)
(no L’hopital’s rule)
Why r u even learning this
I never learnt this
And you are 1/2 year younger than me💀
Going from logarithm to whatever this is is crazy
wintry haven
all the non asians asking why he is learning this :cluelesschatting:
hollow schooner
<@655395215187902486>
bro I don't know anything about Taylor series
😭
haven't reached that part yet
but that's probably the most plausible way to solve the equation if l'hopital's rule doesn't work
hollow schooner
you can rewrite (e^2x + e^-2x - 2) as (e^2x - 1)^2/e^2x
or yea this process of rewriting
zinc raft
all the non asians asking why he is learning this :cluelesschatting:
I am asian
Im from sg
The country with an education model everyone wants to follow
So um
💀
old halo
bro I don't know anything about Taylor series
e^x = 1+x^1/1!+x^2/2!+x^3/3!+… smth like that
zinc raft
I am asian
all the people asking why he is learning this is asian as well
Very likely sh3rk is in some special math program because idk why hes learning advanced topics rn like limit
wintry haven
well i dont know about you but that stuff is in the normal math curriculum for us
and in a couple more asian countries i know people from
wintry haven
The country with an education model everyone wants to follow
who said this is a good education system lmao
its ass
zinc raft
Meh
I think its fine
Anyways id rather study here then in other countries that put so much pressure to study
A good academic background can only get you so far
proven gyro
bro I don't know anything about Taylor series
Taylor swift
proven gyro
Very likely sh3rk is in some special math program because idk why hes learning a...
Funny enough that my school doesn't teach Taylor series
Not even log
zinc raft
I mean
If what you are doing now doesnt need you to learn log
Why bother
Its good to learn but learn the things that help you first
zinc raft
What
Then ur school is just weird for not teaching compulsory topics
If you have a math textbook then learn from it
At least for me thats how i studied for math outside of school
Usually the questions there are crazy hard, more than enough to answer exam questions
Logarithm is my worst topic, so no matter how many questions i did i was still too dumb to do some of the medium difficulty question
But at least i can do every other topic perfectly and only lose marks on topics im not good at
proven gyro
Then ur school is just weird for not teaching compulsory topics
Not school but fucked up curriculum
zinc raft
If logarithms are part of entrance exams then it should be in your curriculum
But ur school didnt teach it when it should be part of the curriculum
dim echo
It's not that simple
To begin with, you should know how disintegrated the education system is in non-first world countries
zinc raft
If you have a math textbook then learn from it
But i still recommend you do this @proven gyro
Even an old one works fine, i used an old book too
old halo
To be fair i dont even remember how to do log anymore
log(a/b)=loga-logb
log(ab)=loga+logb
log(a^b)=bloga
10^(loga)=a
loga=log(R,a)/log(R,10) (R not equal to 0)
that what I remember
old halo
real
proven gyro
But i still recommend you do this <@751840451727982708>
The old one is great unlike the new one lmao
Even the teachers avoid using it
Basically it's a bunch of garbage
zinc raft
Well thats great
For me the old textbook is outdated in a bad way
But i use it for the practice questions
Just do the questions with the new syllabus in mind
proven gyro
I mean I do have a textbook that I learn math from
But it's the college entrance test book
😂
So it's not in depth
proven gyro
Each chapter has 30+ practice question
My book for the college entrance
Btw that's only math
Man I love my live
proven gyro
It's enough alright
But my brain ain't handling 20+ chapters man
Trigono, integral, and derivatives goes brrrr
old halo
d/dx
spare ferry
how do u go abt getting a general soln for the differential equation
d²x/dy² = tan(x)sec²(x)
yes ik this involves trig fuckery
i tried u-sub where my u was sec x but idk how to proceed after the first integration
dim echo
Can't you use the fact that d(tan x)/dx = sec²x?
spare ferry
i tried u-sub where my u was sec x but idk how to proceed after the first integr...
when i went this route i ended up with dy/dx = sec³x/3 + C1
i tried using pythagorean identities but ehhh
idt that was right
spare ferry
Can't you use the fact that d(tan x)/dx = sec²x?
oh wait you meant u-sub using tanx
havent actually thought of that i was so focused on getting rid of tanx instead lmao
dim echo
spare ferry
actually one more
how abt a particular soln for
dy/dx = cos3x/sin2y
y = pi/3 when x = pi/2
wintry haven
you can sacrifice rigor and multiply by dx :uncanny: and sin 2y on both sides
easy integration then
wintry haven
how do u go abt getting a general soln for the differential equation
d²x/dy² = t...
also, is this supposed to be d2x/dy2 or d2y/dx2?
because your answer seems to say its the second but the question says the first
spare ferry
also, is this supposed to be d2x/dy2 or d2y/dx2?
oops yeah
spare ferry
you can sacrifice rigor and multiply by dx :uncanny: and sin 2y on both sides
yea my prof taught that method
lmaoooo
just cant figure out if im supposed to be doing u-sub or playing around with identities
wait
i double checked
here
it actually is dy/dx
wintry haven
yeah? i mean theres no problem with this question
i was talking about the previous one
wintry haven
just cant figure out if im supposed to be doing u-sub or playing around with ide...
yeah you can use substitution to integrate both variables
spare ferry
the problem is actually diff vars but i changed it for convenience and forgor to order them right
spare ferry
yeah you can use substitution to integrate both variables
this is what i ended up with but answer is very different from what i got
wintry haven
you integrated wrong 😭
spare ferry
you integrated wrong 😭
joever
wintry haven
there shouldn't be a square attached to cos 2y lol
its just -1/2 cos2y
same on the other side for x
spare ferry
wait actually
jejckemmfmemfmdmg
me when i forget the u i set
i swear its these little things that always fuck up my chances to get a final exam exemption
wintry haven
so real
spare ferry
ok yeah i got that answer thank
wintry haven
👌
old halo
Do.. do i need to face those stuff too..?
spare ferry
Do.. do i need to face those stuff too..?
if ur going compsci/eng then yeah likely
spare ferry
its time.
spare ferry
actually can i ask finite automata stuff here
im planning to start reviewing later and uh
its a Hard Course
proven gyro
Cool board
spare ferry
no thats automata theory
old halo
random math question
prove lim x->0+ x^x=1 (without saying 0^0=1)
wintry haven
there is nothing to prove about it, the function approaches 1 as x approaches 0+, so the limit is 1 ¯_(ツ)_/¯
spare ferry
yeah
dim echo
random math question
prove lim x->0+ x^x=1 (without saying 0^0=1)
You can't say that when you're talking about limits anyway, because the entire point of limits is to evaluate the function as it approaches the value, not at the exact value. Saying 0^0=1 implies that you are talking about the exact value
You can do that to your calculus lecturer and they'll be pissed
But if you want to prove that, use logarithms and continuous function property
spare ferry
oh yea
frosty nimbus
R we doing some ritual here?
devout light
Meth ritual
dim echo
Invert this function
severe saffron
ez enough
copper snow
my favourite
vestal atlas
Chat how do I do a full mathematical data analysis in just 3 minutes
proven gyro
Chatgpt
raven minnow
Chat how do I do a full mathematical data analysis in just 3 minutes
man even if i try, i cannot do it under 3 minutes xd
vestal atlas
man even if i try, i cannot do it under 3 minutes xd
Lmao
Same
Maths is just fun and painful at same time 💀
raven minnow
when i solve, it could take me minutes to half an hour when done properly
vestal atlas
Bet no one would understand that lmao
vestal atlas
when i solve, it could take me minutes to half an hour when done properly
Me who dosent even fully memorized the multiples of 6 7 8 9
raven minnow
Maths is just fun and painful at same time 💀
but when youre studying engineering, its full of sufferings
vestal atlas
but when youre studying engineering, its full of sufferings
I'd stick to IT
raven minnow
I'd stick to IT
yeaaaaa keep it that way
vestal atlas
I like Computers
raven minnow
HAHAHAHAH
vestal atlas
Like PC repair stuff 💀
vestal atlas
yeaaaaa keep it that way
Idk lmfao
raven minnow
Like PC repair stuff 💀
be an electronics engineer
shameless plugin cuz i study that
vestal atlas
be an electronics engineer
I don't understand college stuff
What does electronics engineering does?
Like u make robot and stuff? Idk
I've literally got 1 year left to get to college
raven minnow
What does electronics engineering does?
basically, we lay the foundation of every electronics possible
vestal atlas
basically, we lay the foundation of every electronics possible
Hmm?
Sorry am dumb
raven minnow
we are responsible for telecommunications such as your wifis and data for example
raven minnow
and this engineering program are a bit misinterpreted as electrical which is totally different
vestal atlas
Fr
I just want something like doing phone surgeries repairing pc stuff idk 💀
Idk
My physique is only good for indoors like office stuff is also possible 💀
raven minnow
and mostly, all the electronics that we see today, such as graphic cards, monitors, cellphones, we study the foundation on how do they be manufactured
vestal atlas
Programming can be a option but yea I don't wanna
raven minnow
My physique is only good for indoors like office stuff is also possible 💀
you can be indoors, its possible
vestal atlas
and mostly, all the electronics that we see today, such as graphic cards, monito...
Oh I see
vestal atlas
you can be indoors, its possible
I haven't touched grass for nearly a month now
Idk if that's fine or not
raven minnow
I haven't touched grass for nearly a month now
me neither
vestal atlas
and mostly, all the electronics that we see today, such as graphic cards, monito...
I don't even know if that could land a Job in the Philippines 💀
100% bad job site
raven minnow
I don't even know if that could land a Job in the Philippines 💀
oh shii you are ph
vestal atlas
oh shii you are ph
Uy pilipins
raven minnow
vestal atlas
frosty nimbus
Do the hard
Bro what 😭
Not + or *
How tf I gonna - or / to have 3 digit
And what even is that additional rule I don't get it
Like 3 is gray then it just turn red what
frosty nimbus
Nah I can put operator on both side
frosty nimbus
Bro what 😭
I think I understand the additional rule
If u put "1" in your equalation the 1 position will not be check
So yeah if u put 1 2 7 8 the position 1 2 7 8 will not be check
That y
Grrrr
Not gonna do the hard
frosty nimbus
I hate how √(2²) not equal to 2 but equal to ±2
sick helm
I hate how √(2²) not equal to 2 but equal to ±2
i remember losing 0.5 points just because i forgot about ±
frosty nimbus
It asian here
20 question 2 point total
1 wrong -1
2 wrong -2
18 correct? Too bad get 0
frosty nimbus
😔
Welcome to asian
Also ts happen every week
Doing exam midteam last week and bro ain't even checking and give us paper back to fix all mistake this week
Even let us pair with other
Paper free
Calculator free
6 hours in total
A=|ij| A=3×4 and aij=2i+3j like bro ts took me week to understand
And just simply ask me does the time enough 😭
Bro there even one question after calculate
A-¹=30
And the c1 i got 28-8=20 which is good since 20/30 is fine
Then c2 got the -8-48=-56 and ofc -56/30 is not happy but ok fine then I go next
c3 -6-46=52 like bro -52/30 ofc we not happy y can't we just -48+8 or -46+6 like the question just rage bait me
||the answer is correct tho||
proven gyro
I hate how √(2²) not equal to 2 but equal to ±2
?
How the hell could you get -2 from √(2²)
Unless ± means approximation
proven gyro
True lmao
dim echo
Even if you replace 2 with x, x would still be 2 because negative square root is undefined
frosty nimbus
cuz √(2²) sound like √4 to me
dim echo
It is
dim echo
Wdym negative Square root
If you ended up with √(x²) and not √(2²), then yes x can be -2 or 2