Q. 14

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Answer :

Given: x cos(a + y) = cos y

To prove:

x cos(a + y) = cos y

Differentiating both sides with respect to x:

{ sin (A + B) = sin A cos B – cos A sin B}

Hence Proved

Differentiating again both sides:

{ sin 2x = 2 sin x cos x}

Hence Proved

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