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Math Help - which of these are true for acute angles?

  1. #1
    rcs
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    which of these are true for acute angles?

    Let A be theta sign.

    I. cos A tan A = sin A
    II. sin ^2 = 1 - cos^2 A
    III. ( sec^2 A ) ( cot A ) = 2csc 2A

    and why?

    can anybody explain me on this...

    thanks
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  2. #2
    MHF Contributor
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    Re: which of these are true for acute angles?

    all three are true ... review your basic identities
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