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IloveCharlie

  • 2 years ago

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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  1. godorovg
    • 2 years ago
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    hello

  2. IloveCharlie
    • 2 years ago
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    1 Attachment
  3. IloveCharlie
    • 2 years ago
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    hi :)

  4. godorovg
    • 2 years ago
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    okay breakdown the problem in your own words

  5. godorovg
    • 2 years ago
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    okay let's start with tan what do we tan is broken down?

  6. godorovg
    • 2 years ago
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    we are working backwards to get to the answer here

  7. IloveCharlie
    • 2 years ago
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    :/ I actually don't really know

  8. godorovg
    • 2 years ago
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    for example tanA= sinA/cosA= SinA/sinC/TanA/ TanB see that

  9. godorovg
    • 2 years ago
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    look at the answers given and compare to what the problem there are clues there

  10. godorovg
    • 2 years ago
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    you still here?

  11. IloveCharlie
    • 2 years ago
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    Yes, sorry. I'm still here! Umm... Let me check

  12. IloveCharlie
    • 2 years ago
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    They all have tan though :/

  13. godorovg
    • 2 years ago
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    yes that is the point because tan is sin/cos

  14. IloveCharlie
    • 2 years ago
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    Yes but how will I know which one is the answer?

  15. godorovg
    • 2 years ago
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    and cos^-1 is 1/cos and sin-1 is 1/sin

  16. godorovg
    • 2 years ago
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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 ?

  17. Australopithecus
    • 2 years ago
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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

  18. Australopithecus
    • 2 years ago
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    note in respect to the image x and y are theta

  19. Australopithecus
    • 2 years ago
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    well theta1 and theta2 respectively

  20. IloveCharlie
    • 2 years ago
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    Oh I see. To me, it looks like the first option is the correct choice

  21. Australopithecus
    • 2 years ago
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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

  22. Australopithecus
    • 2 years ago
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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

  23. Australopithecus
    • 2 years ago
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    also im sure you can derive this instead of memorizing it but idk

  24. godorovg
    • 2 years ago
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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 .

  25. Australopithecus
    • 2 years ago
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    you are adding in that identity though charlie so it wont be the same

  26. Australopithecus
    • 2 years ago
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    http://www.sosmath.com/trig/Trig5/trig5/trig5.html

  27. IloveCharlie
    • 2 years ago
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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

  28. Australopithecus
    • 2 years ago
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    logically I would think so charlie

  29. godorovg
    • 2 years ago
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    yes it is answer three

  30. Australopithecus
    • 2 years ago
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    btw unrelated but do you love charlie day from its always sunny in Philadelphia

  31. IloveCharlie
    • 2 years ago
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    Thank you guys! I really appreciate your help!

  32. Australopithecus
    • 2 years ago
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    or is that exclusive to all charlies

  33. IloveCharlie
    • 2 years ago
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    @Australopithecus Oh, no haha Charlie is my dog lol

  34. godorovg
    • 2 years ago
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    lol funny

  35. Australopithecus
    • 2 years ago
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    sorry I meant inclusive :)

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