4 6*atan (x)*(5 - 2*x*atan(x)) ---------------------------- 2 / 2\ \1 + x /
/ 2 2 \ 3 | 2 10 15*x*atan(x) 4*x *atan (x)| 12*atan (x)*|- atan (x) + ------ - ------------ + -------------| | 2 2 2 | \ 1 + x 1 + x 1 + x / ---------------------------------------------------------------- 2 / 2\ \1 + x /