Math, asked by Anonymous, 1 year ago

hii guys plzz solve thi qstn=

what will be the value of cos12°+cos84°+cos156°+cos132°

Answers

Answered by InsaneJaat
2

cos132+cos12+cos156+cos84

=2cos72cos60+2cos120cos36

=2[(root5-1)/4]1/2+2(-1/2)(root5+1)/4

=-1/2

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