IloveCharlie
Last problem I need help with! :O It's having to do with finding the identity used in the solution. Please click attached
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godorovg
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hello
IloveCharlie
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IloveCharlie
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hi :)
godorovg
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okay breakdown the problem in your own words
godorovg
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okay let's start with tan what do we tan is broken down?
godorovg
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we are working backwards to get to the answer here
IloveCharlie
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:/ I actually don't really know
godorovg
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for example tanA= sinA/cosA= SinA/sinC/TanA/ TanB see that
godorovg
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look at the answers given and compare to what the problem there are clues there
godorovg
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you still here?
IloveCharlie
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Yes, sorry. I'm still here! Umm... Let me check
IloveCharlie
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They all have tan though :/
godorovg
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yes that is the point because tan is sin/cos
IloveCharlie
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Yes but how will I know which one is the answer?
godorovg
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and cos^-1 is 1/cos and sin-1 is 1/sin
godorovg
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austra I am on the track here? I am rusty so I may be leaving a step out can you help ?
Australopithecus
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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
Australopithecus
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note in respect to the image x and y are theta
Australopithecus
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well theta1 and theta2 respectively
IloveCharlie
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Oh I see. To me, it looks like the first option is the correct choice
Australopithecus
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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
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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
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also im sure you can derive this instead of memorizing it but idk
godorovg
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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
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you are adding in that identity though charlie so it wont be the same
IloveCharlie
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@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
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logically I would think so charlie
godorovg
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yes it is answer three
Australopithecus
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btw unrelated but do you love charlie day from its always sunny in Philadelphia
IloveCharlie
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Thank you guys! I really appreciate your help!
Australopithecus
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or is that exclusive to all charlies
IloveCharlie
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@Australopithecus Oh, no haha Charlie is my dog lol
godorovg
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lol funny
Australopithecus
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sorry I meant inclusive :)