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

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

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