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Q. $cos\left(\frac{\pi}{11}\right)+cos\left(\frac{3\pi}{11}\right)+cos\left(\frac{5\pi}{11}\right)+cos\left(\frac{7\pi}{11}\right)+cos\left(\frac{9\pi}{11}\right)=$

Odisha JEEOdisha JEE 2010Trigonometric Functions

Solution:

Correct answer is (b) $1/2$