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Question Number 85582 by jagoll last updated on 23/Mar/20

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

Commented by som(math1967) last updated on 23/Mar/20

$$2cos\left(\frac{\pi }{9}\right)$$

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