Misc 7 - Prove sin 3x + sin2x - sin x = 4 sin x cos x/2 cos 3x/2

Misc 7 - Prove sin 3x + sin2x - sin x = 4 sin x cos x/2 cos 3x/2

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Based on this image's title: “Misc 7 - Prove sin 3x + sin2x - sin x = 4 sin x cos x/2 cos 3x/2