prove-that-sec-2pi-7-sec-4pi-7-sec-8pi-7-4-

Tinku Tara June 4, 2023 Trigonometry 0 Comments

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

prove that sec((2π)/7)+sec((4π)/7)+sec((8π)/7)=−4

$${prove}\:{that} \\ $$$${sec}\frac{\mathrm{2}\pi}{\mathrm{7}}+{sec}\frac{\mathrm{4}\pi}{\mathrm{7}}+{sec}\frac{\mathrm{8}\pi}{\mathrm{7}}=−\mathrm{4} \\ $$$$ \\ $$

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

$${Q}\:{no}\:\mathrm{165558} \\ $$

Commented by SLVR last updated on 03/Jun/22

$${nice}\:{sir} \\ $$

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