If y=5 x-3 x, then d^2 y d x^2 is equal to

MCQ

If $y=5 \cos x-3 \sin x$, then $\frac{d^2 y}{d x^2}$ is equal to

A
$-y$
B
$y$
C
$25 y$
D
$9 y$

✓

Answer

$\begin{array}{l}\text { (a) : We have, } y=5 \cos x-3 \sin x \\ \Rightarrow \frac{d y}{d x}=-5 \sin x-3 \cos x \\ \Rightarrow \frac{d^2 y}{d x^2}=-5 \cos x+3 \sin x=-y\end{array}$

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