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Thread: trigo proving.....

  1. April 14th 2009, 01:35 AM #1
    teckyuan
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    trigo proving.....

    sin^6 -cos^6 = (2sin^2 -1)(1-sin^2+sin^4)
    help me prove this question pls..
    tq
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  2. April 14th 2009, 01:58 AM #2
    mr fantastic
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    Quote Originally Posted by teckyuan View Post
    sin^6 -cos^6 = (2sin^2 -1)(1-sin^2+sin^4)
    help me prove this question pls..
    tq
    Start by noting that \sin^6 x - \cos^6 x = \left( \sin^2 x\right)^3 - \left( \cos^2 x\right)^3 and use the difference of two cubes formula.
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