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  • Aug 15, 2012, 04:21 AM
    Advance_Girl
    prove identities solver
    sin x + sin 3x + sin 5x + 7x = 4 cos x cos 2x cos 4x
  • Aug 15, 2012, 08:19 AM
    ebaines
    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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