JEE MATHEMATICS MCQ: TRIGONOMETRIC EQUATIONS

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The value of

2 \cos \frac{\pi}{13} \cos \frac{9 \pi}{13}+\cos \frac{3 \pi}{13}+\cos \frac{5 \pi}{13}

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Correct option: B

Option B (0) is correct because the expression simplifies to zero using trigonometric identities.

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