Q4 of 123 Page 9

Prove the following identities:


Proof:


Take LHS:




{∵ cos 2x = 2 cos2 x – 1 ⇒ cos 4x = 2 cos2 2x -1}






{∵ cos 2x = 2 cos2 x – 1}




= 2 cos x


= RHS


Hence Proved


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