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Sage
Mathematics
29 May, 04:15
Sin3x-sinx/cos3x-cosx=-cot2x
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Pecan
29 May, 04:31
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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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