Question

\cos ^{2} x + \cos ^{2} (x + \frac{\pi}{3} ) + \cos ^{2} (x - \frac{\pi}{3} ) = \frac{3}{2}cos 2 x+cos 2 (x+ 3 π ​ )+cos 2 (x− 3 π ​ )= 2 3 ​

Answer 1

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