CBSE

MATHEMATICS · Subjective · CBSE · Mathematics · Trigonometric Functions · Trigonometric Functions

Problem

Show that sin⁡x+sin⁡3x+sin⁡5x+sin⁡7x=4sin⁡4xcos⁡2xcos⁡x\sin x + \sin 3x + \sin 5x + \sin 7x = 4 \sin 4x \cos 2x \cos x .

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