Involving csc-1(z+1/z-1)
Involving csc-1(z+1/z-1) and coth-1((-z)1/2)
Involving csc-1(z+1/z-1) and coth-1(1/(-z)1/2)
Involving csc-1(z+1/z-1) and coth-1((-1/z)1/2)