Find the value of ^2 16 + ^2 3 16 + ^2 5 16 + ^2 7 16

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

Problem

Find the value of cos⁡2π16+cos⁡23π16+cos⁡25π16+cos⁡27π16\cos^2 \frac{\pi}{16} + \cos^2 \frac{3\pi}{16} + \cos^2 \frac{5\pi}{16} + \cos^2 \frac{7\pi}{16}

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