-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)