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

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

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