1.

Under root 2 + under root 2 + 2 cos 4 x is equal to 2 cos x

Answer» L.H.S root2+underroot2(1+cos4x)=root2+undreroot2*2cossq2x=root2+2cos2x=root2*(1+cossqx)=root2*2cossqx=2cosx(* it means multiply) we use 1+cossqA=2cossqA in this ques. two times


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