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

- anonymous

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- anonymous

hello

- anonymous

##### 1 Attachment

- anonymous

hi :)

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## More answers

- anonymous

okay breakdown the problem in your own words

- anonymous

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

- anonymous

we are working backwards to get to the answer here

- anonymous

:/ I actually don't really know

- anonymous

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

- anonymous

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

- anonymous

you still here?

- anonymous

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

- anonymous

They all have tan though :/

- anonymous

yes that is the point because tan is sin/cos

- anonymous

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

- anonymous

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

- anonymous

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

- Australopithecus

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

##### 1 Attachment

- Australopithecus

note in respect to the image x and y are theta

- Australopithecus

well theta1 and theta2 respectively

- anonymous

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

- Australopithecus

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

- Australopithecus

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

- Australopithecus

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

- anonymous

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 .

- Australopithecus

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

- Australopithecus

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

- anonymous

@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

- Australopithecus

logically I would think so charlie

- anonymous

yes it is answer three

- Australopithecus

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

- anonymous

Thank you guys! I really appreciate your help!

- Australopithecus

or is that exclusive to all charlies

- anonymous

@Australopithecus Oh, no haha Charlie is my dog lol

- anonymous

lol funny

- Australopithecus

sorry I meant inclusive :)

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