trigonometric equation and identities | Revision Server | Page 1

shrewd cairn Jan 28, 2023, 8:45 PM

#

Is this correct ?

#

toxic glen Jan 28, 2023, 8:48 PM

#

which one

shrewd cairn Jan 28, 2023, 8:54 PM

#

toxic glen which one

6 e

toxic glen Jan 28, 2023, 8:55 PM

#

ghost ping? lol

#

are you in radians @shrewd cairn

shrewd cairn Jan 28, 2023, 8:56 PM

#

how u do that

toxic glen Jan 28, 2023, 8:57 PM

#

the inverse tan part aint right

shrewd cairn Jan 28, 2023, 8:57 PM

#

idts

#

cuz i got the answers right but few of them were missing

toxic glen Jan 28, 2023, 8:57 PM

#

wait i thought you wrote no solution mb

shrewd cairn Jan 28, 2023, 8:57 PM

#

toxic glen the inverse tan part aint right

ik i wrote thats not the solution

toxic glen Jan 28, 2023, 8:59 PM

#

150 330 510 690 are correct

#

@shrewd cairn

shrewd cairn Jan 28, 2023, 9:00 PM

#

y are the rest wrong

toxic glen Jan 28, 2023, 9:00 PM

#

tan-1 (-root3 / 3) is -30

#

now if you think about the tan graph

#

it repeats every 180

shrewd cairn Jan 28, 2023, 9:01 PM

#

yea

toxic glen Jan 28, 2023, 9:01 PM

#

-30 is a solution but isnt in the range so we dont count it

#

add on 180 to -30 to get the first solution

#

150

#

then i kept adding 180 till i couldnt go past the range

shrewd cairn Jan 28, 2023, 9:01 PM

#

and y is 120 wrong

shrewd cairn Jan 28, 2023, 9:02 PM

#

toxic glen tan-1 (-root3 / 3) is -30

but i dont put this is in the calculator thats what i was taught

toxic glen Jan 28, 2023, 9:02 PM

#

tf

shrewd cairn Jan 28, 2023, 9:03 PM

#

u do the inverse of the positive

#

value

toxic glen Jan 28, 2023, 9:03 PM

#

that's bs icl

shrewd cairn Jan 28, 2023, 9:03 PM

#

then

#

use cast diagram

toxic glen Jan 28, 2023, 9:03 PM

#

the first step is to take the inverse

#

then to get the other solutions you use the graph of sin/cos/tan or a cast diagram

shrewd cairn Jan 28, 2023, 9:04 PM

#

lol now im confused asf

toxic glen Jan 28, 2023, 9:05 PM

#

do u get the first step

shrewd cairn Jan 28, 2023, 9:05 PM

#

wdym the inverse part ?

toxic glen Jan 28, 2023, 9:05 PM

#

so yk how its tan x = -rt3 / 3

#

find the value of tan^-1(-rt3/3

shrewd cairn Jan 28, 2023, 9:05 PM

#

its the same thing tho

#

bcuz

#

im not taking negatuve sign into consideration but when imm drawing cast diagram im putting the values where tan is negative

toxic glen Jan 28, 2023, 9:07 PM

#

its not the same thing

#

cast diagram is long anyway u should use a graph

shrewd cairn Jan 28, 2023, 9:09 PM

#

damn our sit told to use cast diagram for now

#

sir*

toxic glen Jan 28, 2023, 9:11 PM

#

why did he say to take inverse of the positive value

shrewd cairn Jan 28, 2023, 9:12 PM

#

toxic glen why did he say to take inverse of the positive value

idek he said to do that and im remeber that clearly i hv done the same thing in my notebook when he was teaching

shrewd cairn Jan 28, 2023, 9:12 PM

#

toxic glen why did he say to take inverse of the positive value

and i did that same thing for 6b i got the right answer

toxic glen Jan 28, 2023, 9:15 PM

#

this aint gonna work for every question

shrewd cairn Jan 28, 2023, 9:15 PM

#

toxic glen this aint gonna work for every question

imma ask him bcuz thats the way he taught us so yea

shrewd cairn Jan 28, 2023, 9:16 PM

#

toxic glen this aint gonna work for every question

calc only gives 1 solution it wont give the other solution

toxic glen Jan 28, 2023, 9:16 PM

#

for 6b

#

?

shrewd cairn Jan 28, 2023, 9:17 PM

#

toxic glen for 6b

for any question

toxic glen Jan 28, 2023, 9:18 PM

#

im so confused lol

#

idk ask him about it

shrewd cairn Jan 28, 2023, 9:18 PM

#

aight aight thx tho

shrewd cairn Jan 29, 2023, 6:26 PM

#

toxic glen im so confused lol

yo so what u are saying is u get the value in the caclulator and add 180 if its tan 360 if its cos or sin i dont need cast diagram

shrewd cairn Jan 29, 2023, 6:55 PM

#

tbh nvm this shit conusing imma ask him

toxic glen Jan 29, 2023, 10:14 PM

#

shrewd cairn yo so what u are saying is u get the value in the caclulator and add 180 if its ...

yep

#

tan : +-180

#

cos a = cos -a, then add 360 to both

shrewd cairn Jan 29, 2023, 10:14 PM

#

Istg he taught us something wrong fr 😭😭

toxic glen Jan 29, 2023, 10:16 PM

#

you should sketch the graphs of sin cos and tan

#

and see how the values repeat

shrewd cairn Jan 30, 2023, 12:31 AM

#

i dont like it that way tbh and on top of that our sir recoomended cast diagram so yea

shrewd cairn Jan 30, 2023, 12:31 AM

#

toxic glen you should sketch the graphs of sin cos and tan

lol he says he has a shortcut method but he wont tell us for the next 2 weeks

kindred wyvern Jan 30, 2023, 8:30 AM

#

Yeah man use this diagram isn’t good

#

Graphs are more useful as ure Gnna need to be sketching a lot of things so better to remember them

toxic glen Jan 31, 2023, 9:44 PM

#

what kinda goofy teacher do u have

#

first he got the first step wrong and now he has a secret 'shortcut' method

tough sparrow Jan 31, 2023, 9:47 PM

#

shrewd cairn lol he says he has a shortcut method but he wont tell us for the next 2 weeks

Bruh when anyone uses the cast diagram for trig you’ll get shouted at for not sketching the graph

shrewd cairn Jan 31, 2023, 10:28 PM

#

tough sparrow Bruh when anyone uses the cast diagram for trig you’ll get shouted at for not sk...

Y it is still correct tho and I understood how u deal with negative ones so yea

#trigonometric equation and identities