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Question Number 156321 by cortano last updated on 10/Oct/21

$$\cos {}^4\left(\frac{\pi }{9}\right)+\cos {}^4\left(\frac{2\pi }{9}\right)+\cos {}^4\left(\frac{3\pi }{9}\right)+\cos {}^4\left(\frac{4\pi }{9}\right)=?$$

Commented by john_santu last updated on 10/Oct/21

$$ans:\frac{19}{16}$$

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