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Question Number 185861 by cortano1 last updated on 29/Jan/23

$$\cos \left(\frac{2\pi }{13}\right)+\cos \left(\frac{6\pi }{13}\right)+\cos \left(\frac{8\pi }{13}\right)=?$$

Commented by Frix last updated on 29/Jan/23

$$\frac{-1+\sqrt{13}}{4}$$

Commented by cortano1 last updated on 29/Jan/23

$$how$$

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