3 years ago

Sin3x-sinx/cos3x-cosx=-cot2x

1 answer:

5 0

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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