Math, asked by Twinkle6548, 1 year ago

Prove that Cos45°cos15°-sin45°sin15°=1/2

Answers

Answered by saurabhsemalti
14
we know
cosa cosb -sinasinb=cos(a+b)
here a=45,b=15
LHS reduced to cos(45+15)=cos60=1/2...
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