Inverse cosine: Representations through equivalent functions (subsection 27/02/12/15)

ArcCos

$Mathematica Notation$

Involving cos^-1(z+c/z^1/2)

Involving cos^-1(z-1/z^1/2) and sech^-1(z^1/2)

Involving cos^-1(z+1/z^1/2) and sech^-1(z/z+1^1/2)