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Math Help - sin and cos

  1. #1
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    Nov 2005
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    Help Please!!!!

    Figured it out nevermind!!! I have another question though.

    Cos^2 x=

    I put 1-sin(x) and of course it was marked wrong. I was given advice to refer to the Identity of sin^2 x + cos^2 x=1. How can I apply that or is that the answer itself?
    Last edited by Crystalsicles; November 15th 2005 at 12:30 PM.
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  2. #2
    Site Founder MathGuru's Avatar
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    sin^2 x + cos^2 x = 1

    now subtract sin^2 x from both sides

    cos^2 x = 1 - sin^2 x
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  3. #3
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    Wow I feel dumb. Thanks so much for ur help though.
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