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

  • A
    $y$
  • B
    $-4 y$
  • C
    $4 y$
  • D
    $-y$

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यदि $\sqrt{1-x^2}+\sqrt{1-y^2}=a(x-y)$ है, तो $\left[\left(1-x^2\right)^2 \frac{d^2 y}{d x^2}+y\left(1-x^2\right)\right] \frac{d y}{d x}=$

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