Final Answer
$2\sec\left(x\right)^2\tan\left(x\right)+\frac{2x}{\left(1+x^2\right)^2}$
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Step-by-step Solution
Specify the solving method
1
Find the ($1$) derivative
$\sec\left(x\right)^2+\frac{-1}{1+x^2}$
2
Find the ($2$) derivative
$2\sec\left(x\right)^2\tan\left(x\right)+\frac{2x}{\left(1+x^2\right)^2}$
Final Answer
$2\sec\left(x\right)^2\tan\left(x\right)+\frac{2x}{\left(1+x^2\right)^2}$