x ------ - acot(x) 2 1 + x
x/(1 + x^2) - acot(x)
2 2 2*x ------ - --------- 2 2 1 + x / 2\ \1 + x /
/ 2 \ | x | 8*x*|-1 + ------| | 2| \ 1 + x / ----------------- 2 / 2\ \1 + x /
/ 4 2 \ | 6*x 7*x | 8*|-1 - --------- + ------| | 2 2| | / 2\ 1 + x | \ \1 + x / / --------------------------- 2 / 2\ \1 + x /