Show that sin 3x -sin 2x -sin x -4sin x cos x 2 cos 3x 2

Show that si...

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Show that $sin 3 x + sin 2 x - sin x = 4 sin x cos \frac{x}{2} cos \frac{3 x}{2}$

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Prove that sin 3x + sin 2x - sin x = 4 sin x cos $\frac{x}{2} c o s \frac{3 x}{2}$

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