Mathematics Differential Calculus Second Order Derivatives

Find \(\rm \frac {d^2 \cot^ {-1}x}{dx^2}\)

1
\(\rm \frac{-2x}{(1+x^2)^2} \)
2
\(\rm \frac{-2}{(1+x^2)^2} \)
3
\(\rm \frac{-1}{(1+x^2)^2} \)
4
\(\rm \frac{2x}{(1+x^2)^2} \)

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