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    ronald172009's Avatar
    ronald172009 Posts: 1, Reputation: 1
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    #1

    Jun 29, 2012, 04:28 AM
    prove trig identities solver
    Prove cos^4 x - sin^4 x = cos 2x
    ebaines's Avatar
    ebaines Posts: 12,130, Reputation: 1307
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    #2

    Jun 29, 2012, 06:50 AM
    Note that the equation is the difference of two squares - so you can factor it. After that see if what you get looks like an identity for cos2x.

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