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Prove that: (sin 3x + sin x) sin x + (co...

Prove that: `(sin 3x + sin x) sin x + (cos 3x- cos x) cos x = 0`

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To prove that \[ (\sin 3x + \sin x) \sin x + (\cos 3x - \cos x) \cos x = 0, \] we will start by simplifying the left-hand side step by step. ...
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