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Math Help - Trig function q

  1. #1
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    Trig function q

    If cos A = 3/5, express cos^2 A - sin^2 A in the form p/q.
    I've found sin = 4/5 but I know how to express it into cos^2A and all.
    Can someone help me please? Thanks!
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  2. #2
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    Quote Originally Posted by Detanon View Post
    If cos A = 3/5, express cos^2 A - sin^2 A in the form p/q.
    I've found sin = 4/5 but I know how to express it into cos^2A and all.
    Can someone help me please? Thanks!
    But all that remains now is fraction computation...

    cos A = 3/5, sin A = 4/5. So cos^2 A = 9/25, sin^2 A= 16/25 and so on...
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