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13 July, 23:04

Sin3x-sinx/cos3x-cosx=-cot2x

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  1. 14 July, 02:47
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    Reduce terms: (sin x + sin 3x) / (cos x - cos 3x) = cos (2x) / sin (2x)

    (sin x + sin 3x) / (cos x - cos 3x) = cot (2x)

    The last line proves the identity (sin x + sin 3x) / (cos x - cos 3x) = cot (2x)
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