Question

What is the derivative of `ln(arctanx)`?

Answer 1

`=1/((1+x^2)(tan^(-1)x))`

Explanation:

`d/dxln(tan^(-1)x)=1/(tan^(-1)x)*d/dxtan^(-1)x`

`=1/(tan^(-1)x)*1/(1+x^2)`