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