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

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

p r o v e t h a t

s e c \frac{2 π}{7} + s e c \frac{4 π}{7} + s e c \frac{8 π}{7} = - 4

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

Q n o 165558

Commented by SLVR last updated on 03/Jun/22

n i c e s i r

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