Psychology, asked by yashwanth77777, 11 months ago

The value of cos 12° + cos 84° + cos132° + cos156° is

Answers

Answered by khwaishrai9780

10

Answer:

Explanation:

cos132+cos12+cos156+cos84

=2cos72cos60+2cos120cos36

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

=-1/2

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