(a) State the identity that rewrites as a product. (b) Using this identity, show that…

MATHEMATICS · Subjective · A Level · Mathematics · Trigonometry · Trigonometry

Problem

(a) State the identity that rewrites sin⁡A−sin⁡B\sin A-\sin B as a product. (b) Using this identity, show that sin⁡7x−sin⁡5x=2cos⁡6xsin⁡x\sin 7x-\sin 5x=2\cos 6x\sin x.

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