find cos((π/7)) by solving the equation x^7 −1=0 inside C .


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Question Number 49963 by maxmathsup by imad last updated on 12/Dec/18

$f i n d c o s (\frac{π}{7}) b y s o l v i n g t h e e q u a t i o n x^{7} - 1 = 0 i n s i d e C .$
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