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Question Number 170902 by mathlove last updated on 03/Jun/22

$$provethat$$$$sec\frac{2\pi }{7}+sec\frac{4\pi }{7}+sec\frac{8\pi }{7}=-4$$$$$$

Commented by som(math1967) last updated on 03/Jun/22

$$Qno165558$$

Commented by SLVR last updated on 03/Jun/22

$$nicesir$$

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