1 ------------- ________ / 2 x*\/ x - 1
1/(x*sqrt(x^2 - 1))
(-1.0 + x^2)^(-0.5)/x
1 ---------------------- __________________ x*\/ (1 + x)*(-1 + x)
1/(x*sqrt((1 + x)*(-1 + x)))
_________ / 2 \/ -1 + x ------------ / 2\ x*\-1 + x /
sqrt(-1 + x^2)/(x*(-1 + x^2))