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what is the value of cos12 + cos84 + cos156 + cos132

what is the value of cos12 + cos84 + cos156 + cos132

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2 Answers

Sunil Raikwar
askIITians Faculty 45 Points
7 years ago
cos132+cos12+cos156+cos84
=2cos72cos60+2cos120cos36
=2[(root5-1)/4]1/2+2(-1/2)(root5+1)/4
=-1/2

Thanks & Regards
Sunil Raikwar
askIITians Faculty
verma
13 Points
3 years ago
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