/ 2 \ 2*\1 + tan (atan(x))/*(-x + tan(atan(x))) ----------------------------------------- 2 / 2\ \1 + x /
/ 2 2 2 \ / 2 \ | 1 + tan (atan(x)) 2*tan (atan(x)) 4*x 6*x*tan(atan(x))| 2*\1 + tan (atan(x))/*|-1 + ----------------- + --------------- + ------ - ----------------| | 2 2 2 2 | \ 1 + x 1 + x 1 + x 1 + x / -------------------------------------------------------------------------------------------- 2 / 2\ \1 + x /