1 ----- - y 1 - y -------------- / 2 \ | y - y + 1 | |------------| | 2 | \y - 2*y + 1/
(1/(1.0 - y) - y)*(1.0 + y^2 - 2.0*y)/(1.0 + y^2 - y)
/ 2 \ (1 - y*(1 - y))*\1 + y - 2*y/ ------------------------------ / 2 \ (1 - y)*\1 + y - y/
(1 + y*(-2 + y))*(1 - y*(1 - y)) -------------------------------- (1 - y)*(1 + y*(-1 + y))
/ 1 \ / 2 \ |----- - y|*\1 + y - 2*y/ \1 - y / -------------------------- 2 1 + y - y