Math, asked by raghav108, 1 year ago

cos pie/7+cos 2pie/7 +cos 3pie/7 +cos 4pie/7 +cos5pie/7 +cos6pie/7 +cos7pie/7

Answers

Answered by JackJ
1
-1
club cos pi/7 and cos 6pi/7
then cos2pi/7 and cos5pi/7
and so on...this is zero
then cos7pi/7 is cos pi which is -1
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