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-- Mathematics - Section B1
Inverse Trigonometric Functions
The derivative of $\frac{tan^{-1}x}{1+tan^{-1}x}$ with respect to $tan^{-1}x$ is :
$\frac{tan^{-1}x}{(1+tan^{-1}x)^2}$
$\frac{1}{(1+tan^{-1}x)^2}$
$(1+tan^{-1}x)^2$
$\frac{tan^{-1}x}{(1-tan^{-1}x)^2}$