x E *atan(x)
x e x ------ + atan(x)*e 2 1 + x
/ 2 2*x \ x |------ - --------- + atan(x)|*e | 2 2 | |1 + x / 2\ | \ \1 + x / /
/ 2 \ | 2 3 6*x 8*x | x |- --------- + ------ - --------- + --------- + atan(x)|*e | 2 2 2 3 | | / 2\ 1 + x / 2\ / 2\ | \ \1 + x / \1 + x / \1 + x / /