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Math Help - Some trig questions part 1

  1. #1
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    Some trig questions part 1

    Please help.

    1) \cot \theta = -7/2, \cos \theta .........(Jhevon says: \color{red}\cos \theta what?)
    2) \tan^{-1}(1)
    3) \sin^{-1}(1)
    Last edited by Jhevon; April 27th 2009 at 09:27 PM. Reason: Moved from original thread
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  2. #2
    Member SengNee's Avatar
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    Quote Originally Posted by donnyB View Post
    Please help.

    1) cot0= -7/2, cos0
    2) tan=1(1)
    3) sin-1(1)
    1) cot0= -7/2, cos0

    \cot0 should be equal to 0 right?

    Or you mean \cot\theta?

    If yes, then



    By Pythagorous Theorem, you can get x.
    \cot\theta will be -ve when II and IV quadrants.



    2) tan=1(1)

    Where is the reference angle for your tangent?



    3) sin-1(1)

    Do you mean \sin^{-1}1?

    If yes,

    From the graph of sine, the angle should be 90^o, 450^o, 810^o, ...
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