Inverse tangent: Representations through equivalent functions (subsection 27/02/04/08)

ArcTan

$Mathematica Notation$

Involving tan^-1(z-1/z+1)

Involving tan^-1(z-1/z+1) and cot^-1(z)

Involving tan^-1(z-1/z+1) and cot^-1(1/z)

ArcTan[x,y]