Find the value of .

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

Problem

Find the value of 2cos⁡π3cos⁡9π13+cos⁡3π13+cos⁡5π132\cos\frac{\pi}{3}\cos\frac{9\pi}{13}+\cos\frac{3\pi}{13}+\cos\frac{5\pi}{13}.

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