$x=\cos \theta,y= \sin 5 \theta =>(1-x^2)\large\frac{d^2y}{dx^2}$$- x \large\frac{dy}{dx}$ is equal to

Question

$$\begin {array} {1 1} (a)\;-5y & \quad (b)\;5y \\ (c)\;25 y & \quad (d)\;-25 y \end {array}$$

Comments

I want to get answer above question