Question

Last problem I need help with! :O It's having to do with finding the identity used in the solution. Please click attached

Answer 1

hello

Answer 2

hi :)

Answer 3

okay breakdown the problem in your own words

Answer 4

okay let's start with tan what do we tan is broken down?

Answer 5

we are working backwards to get to the answer here

Answer 6

:/ I actually don't really know

Answer 7

for example tanA= sinA/cosA= SinA/sinC/TanA/ TanB see that

Answer 8

look at the answers given and compare to what the problem there are clues there

Answer 9

you still here?

Answer 10

Yes, sorry. I'm still here! Umm... Let me check

Answer 11

They all have tan though :/

Answer 12

yes that is the point because tan is sin/cos

Answer 13

Yes but how will I know which one is the answer?

Answer 14

and cos^-1 is 1/cos and sin-1 is 1/sin

Answer 15

austra I am on the track here? I am rusty so I may be leaving a step out can you help ?

Answer 16

Fun,

look at -arccos(3/5) and arcsin(5/13) as just numbers because that is what they are

so set

x = arcsin(5/13
and
y = -arccos(3/5)

and see the identity attached

Answer 17

note in respect to the image x and y are theta

Answer 18

well theta1 and theta2 respectively

Answer 19

Oh I see. To me, it looks like the first option is the correct choice

Answer 20

this problem is just about being able to look up trig identities I dont think you will ever have to memorize these unless you go into majoring mathematics even then I doubt you would ever have to

Answer 21

well there are some trig identites that are important to know but this one I do not believe is used very commonly in early mathematics courses

Answer 22

also im sure you can derive this instead of memorizing it but idk

Answer 23

hey charlie I was trying to backwards with you,because sometimes it is easier that way. I don't want to mess you up so please let me know .

Answer 24

you are adding in that identity though charlie so it wont be the same

Answer 25

http://www.sosmath.com/trig/Trig5/trig5/trig5.html

Answer 26

@godorovg Oh, it's fine. I just didn't quite understand that way but I appreciate your help. @Australopithecus so... the third oone? I'm trying to match up

Answer 27

logically I would think so charlie

Answer 28

yes it is answer three

Answer 29

btw unrelated but do you love charlie day from its always sunny in Philadelphia

Answer 30

Thank you guys! I really appreciate your help!

Answer 31

or is that exclusive to all charlies

Answer 32

@Australopithecus Oh, no haha Charlie is my dog lol

Answer 33

lol funny

Answer 34

sorry I meant inclusive :)