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The value of cos π/7 ​ +cos (...

The value of `cos π/7 ​ +cos ((2π)/7) ​ +cos ((3π)/7) ​ +cos ((4π)/7) ​ +cos ((5π)/7) ​ +cos ((6π)/7) ​ +cos ((7π)/7)` ​ is

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