Q. 143.7( 6 Votes )

If then prove that Hence, show that


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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