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Solve this following

Question:

If $y=\left(\cot ^{-1}\right)^{2}$, then show that $\left(x^{2}+1\right)^{2} \frac{d^{2} y}{d x^{2}}+2 x\left(x^{2}+1\right) \frac{d y}{d x}=2$

Solution:

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