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Thread: Help with a Trig Identity Problem

  1. June 30th 2007, 08:18 AM #1
    andy11
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    Help with a Trig Identity Problem

    If we establish an identity, sinAcscA - sin2A could equal which of the following quantities?

    1
    cos^(2) x A
    sin^(2) x A – 1
    tan^(2) x A

    thanks
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  2. June 30th 2007, 08:22 AM #2
    topsquark
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    Quote Originally Posted by andy11 View Post
    If we establish an identity, sinAcscA - sin2A could equal which of the following quantities?

    1
    cos2A
    sin2A – 1
    tan2A

    thanks
    sin(A)csc(A) - sin^2(A)<-- I had to be a bit of an oracle here!

    = \frac{sin(A)}{sin(A)} - sin^2(A)

    = 1 - sin^2(A) = cos^2(A)

    -Dan
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