Докажите равенство
[tex]cos\frac{\pi }{n} +cos\frac{3\pi }{n} +... + cos\frac{(2n-1)\pi }{n} =0[/tex]
[tex]cos\frac{\pi }{n} +cos\frac{3\pi }{n} +... + cos\frac{(2n-1)\pi }{n} =0[/tex]
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