-10*acot(5*x) ------------- 2 1 + 25*x
50*(1 + 10*x*acot(5*x)) ----------------------- 2 / 2\ \1 + 25*x /
/ 2 \ | 15*x 100*x *acot(5*x) | 500*|- --------- - ---------------- + acot(5*x)| | 2 2 | \ 1 + 25*x 1 + 25*x / ------------------------------------------------ 2 / 2\ \1 + 25*x /