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    mollieblake's Avatar
    mollieblake Posts: 2, Reputation: 1
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    #1

    Apr 11, 2012, 09:06 PM
    Verify this identity: cos^2x=(1/2)cos2x
    A friend asked me to try to help, and I can't get it.
    rpray2007's Avatar
    rpray2007 Posts: 319, Reputation: 23
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    #2

    Apr 11, 2012, 09:51 PM
    I think the identity you are trying to solve for is:



    Remember the identities:

    and
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I needd helppp. I can't verify this identity! Pleasee help and show full work. Thanks :)

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