Math, asked by neelamlokesh1706, 1 year ago

Cos 12 degree + cos 84 degree + cos 156 degree + cos 132 degree is equal to what

Answers

Answered by shyam999

2

cos132+cos12+cos84+cos156=2cos132+122cos132−122+2cos84+1562cos156−842=2cos72cos60+2cos120cos36.

But this is

cos72−cos36=5√−14−5√+14=−1/2

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