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    lawhaley's Avatar
    lawhaley Posts: 1, Reputation: 1
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    #1

    Oct 15, 2009, 05:25 PM
    solving trigonometric identities
    Can some please help me solve the following:

    cos4-sin4=1-2sin2

    thanks
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Oct 17, 2009, 08:57 AM

    Well, notice that is the difference of two perfect squares. Factorise it, and I'm sure you can get the answer easily.

    Got it? Post how you did it.

    Still don't see it, post, we'll tell you how to do it :)
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