Involving cos-1(1/(c z)1/2)
Involving cos-1(1/z1/2) and cosh-1(1/z1/2)
Involving cos-1(1/(-z)1/2) and cosh-1(z+1/z1/2)
Involving cos-1(1/(-z)1/2) and cosh-1(z+2/z)