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Q)

If $y_{_k}$ is the $k^{th}$ derivative of $y$ with respect to $'x'$ and $y = \cos (\sin x)$, then $y_{_1} \sin x+y_{_2} \cos x$ is equal to :


( A ) $y \sin^3 x$
( B ) $y \cos^3 x$
( C ) $-y \sin^3 x$
( D ) $-y \cos^3 x$

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