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    superracer21x's Avatar
    superracer21x Posts: 2, Reputation: 1
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    #1

    Feb 14, 2012, 12:56 AM
    Help with trigonometric identity
    sin2x/sinx - cos2x/cosx = secx
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Feb 14, 2012, 06:37 AM
    If you apply the identities sin(2x) = 2 sin(x)cos(x) and cos(2x) = 2cos(x) -1 it world right out.
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