If xcos(a+y)=cos y then prove that dydx=cos2(a+y)sin a. Hence, s – InterviewSolution

1.	If xcos(a+y)=cos y then prove that dydx=cos2(a+y)sin a. Hence, show that sin ad2ydx2+sin 2(a+y)dydx=0.
Answer» $If x cos (a + y) = cos y then prove that$ $\frac{d y}{d x} = \frac{{cos}^{2} (a + y)}{sin a}$ . $Hence, show that sin a \frac{d^{2} y}{d x^{2}} + sin 2 (a + y) \frac{d y}{d x} = 0$ .

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