Show that 2 + 2 + 2 + 2 8 = 2

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

Problem

Show that 2+2+2+2cos⁡8θ=2cos⁡θ\sqrt{2 + \sqrt{2 + \sqrt{2 + 2 \cos 8\theta}}} = 2 \cos \theta

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