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    Dan0655 Posts: 1, Reputation: 1
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    #1

    Apr 15, 2013, 10:31 AM
    Verify cos^2(2t)+4sin^2(t) = 4sin^4(t)+1
    Math problem
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Apr 15, 2013, 11:24 AM
    Hints:

    (sin^2t + cos^2t)^2 = 1

    cos^2(2t) = (cos^2t - sin^2t)^2
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