Math, asked by Thunder5837, 1 year ago

cos^2(2a)-sin^2(a)=cos(a)cos3a

Answers

Answered by san7131

4

by taking L.h.s.

cos ^2(2a) - sin^2 a

cos ^2(2a) - ( 1-cos 2a) /2

(cos 4a+1)/2 + (cos 2a-1)/2

1/2 [ 2 cos 3a cos a]

= cos 3a cos a

R.h.s

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