Determine the number of distinct solutions of in the interval .

MATHEMATICS · Single correct · A Level · Mathematics · Trigonometry · Trigonometry

Problem

Determine the number of distinct solutions of cos⁡5x=cos⁡x\cos 5x = \cos x in the interval 0≤x<2π0\le x<2\pi. (a) 66 (b) 1010 (c) 88 (d) 99

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