sqrt(1/(1 + x^2) - x^2/(1 + x^2))
_________________ / 2 / 1 x / ------ - ------ / 2 2 \/ 1 + x 1 + x
____________________ / -(1 + x)*(-1 + x) / ------------------ / 2 \/ 1 + x
sqrt(-(1 + x)*(-1 + x)/(1 + x^2))
_________________ / 2 / 1 x / ------ - ------ / 2 2 \/ 1 + x 1 + x
sqrt(1/(1 + x^2) - x^2/(1 + x^2))