/ 2\ x*log\1 + x / - 2*x + 2*atan(x)
x*log(1 + x^2) - 2*x + 2*atan(x)
2 2 2*x / 2\ -2 + ------ + ------ + log\1 + x / 2 2 1 + x 1 + x
/ 2 \ | 2 2*x | 2*x*|3 - ------ - ------| | 2 2| \ 1 + x 1 + x / ------------------------- 2 1 + x
/ 2 2 4 \ | 2 12*x 8*x 8*x | 2*|3 - ------ - ------ + --------- + ---------| | 2 2 2 2| | 1 + x 1 + x / 2\ / 2\ | \ \1 + x / \1 + x / / ----------------------------------------------- 2 1 + x