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    Advance_Girl Posts: 1, Reputation: 1
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    #1

    Aug 15, 2012, 04:21 AM
    prove identities solver
    sin x + sin 3x + sin 5x + 7x = 4 cos x cos 2x cos 4x
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    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Aug 15, 2012, 08:19 AM
    Your formula is incorrect. Consider the case x=0: the left hand side equals 0 while the right hand side equals 4.

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