જો $y=a \cos (\sin 2 x)+b \sin (\sin 2 x)$ હોય, તો $y^{\prime \prime}+(2 \tan 2 x) y^{\prime}$ ની કિંમત શોધો.

  • A
    $0$
  • B
    $4(\cos ^2 2 x) y$
  • C
    $-4(\cos ^2 2 x) y$
  • D
    $-\cos ^2 2 x y$

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$\begin{aligned} & y=\sin \left(\log \left(x^2+2 x+1\right)\right) \\ & \Rightarrow(x+1)^2 \frac{d^2 y}{d x^2}+(x+1) \frac{d y}{d x}= \end{aligned}$

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