Suggested: cos4x+cos3x+cos2x/sin4x+sin3x+sin2x=cot3x - sinx+sin3x+sin5x+sin7x=4 cos x cos2x sin4x - prove that sinx+sin3x+sin5x+sin7x=4 cosx cos2x sin4x - sin8x cosx-sin6x cos3x/cos2x cosx-sin3x sin4x=tan2x - cos4x sin3x-cos2x sin x/sin4x sinx+cos6x cosx - sinx+sin2x+sin3x+sin4x=0 - sin4x=sin3x Browse related:
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