3 x + x + acot(x)
x + x^3 + acot(x)
1 2 1 - ------ + 3*x 2 1 + x
/ 1 \ 2*x*|3 + ---------| | 2| | / 2\ | \ \1 + x / /
/ 2 \ | 1 4*x | 2*|3 + --------- - ---------| | 2 3| | / 2\ / 2\ | \ \1 + x / \1 + x / /