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Math Help - How to show this?

  1. #1
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    How to show this?

    Okey, my homework is to show/prove that
    arcsin(-x) = -arcsinx! I can see it from unit circle but I dont know how to make a nice formula.

    thnx
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  2. #2
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    Quote Originally Posted by tintti View Post
    Okey, my homework is to show/prove that
    arcsin(-x) = -arcsinx! I can see it from unit circle but I dont know how to make a nice formula.

    thnx
    arcsin(-x) = A

    => sin A = -x => - sin A = x => sin (-A) = x => arcsin(x) = -A

    => -arcsin(x) = A.

    Therefore arcsin(-x) = -arcsin(x)
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