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Find the summation of the following: cos π/7 + cos 2π/7 + cos 3π/7 + cos 4π/7 + cos 5π/7 + cos 6π/7

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Find the summation of the following:

cos π/7 + cos 2π/7 + cos 3π/7 + cos 4π/7 + cos 5π/7 + cos 6π/7

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cos π/7 + cos 2π/7 + cos 3π/7 + cos 4π/7 + cos 5π/7 + cos 6π/7

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