Q15 of 268 Page 5

Prove the following identities :

Taking LHS



[∵ (a + b)2 = (a2 + b2 + 2ab) and (a – b)2 = (a2 + b2 – 2ab)]



[∵ cos2 θ + sin2 θ = 1]



=RHS


Hence Proved


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