Question

What is the derivative of arctan(y/x) ?

Answer 1

derivative in respect to x?

Answer 2

yes

Answer 3

\[\frac{ d }{ dx }\left( \tan^{-1} \frac{ y }{ x } \right)=\frac{ 1 }{ 1+\frac{ y^2 }{ x^2 } }\frac{ d }{ dx }\left( \frac{ y }{ x } \right)\]=?