Involving cos^-1(((1-(1+c z²)^1/2)/2)^1/2)

Involving cos^-1(((1-(1+z²)^1/2)/2)^1/2) and sec^-1(-i/z)

Involving cos^-1(((1-(1-z²)^1/2)/2)^1/2) and sec^-1(1/z)