/ x*(-1 + x*atan(x)) \ 6*|- ------------------ + atan(x)|*atan(x) | 2 | \ 1 + x / ------------------------------------------ 2 1 + x
/ / 2 2 \ \ | | 1 2 6*x*atan(x) 4*x *atan (x)| | 6*|x*|------ - atan (x) - ----------- + -------------| - 3*(-1 + x*atan(x))*atan(x)| | | 2 2 2 | | \ \1 + x 1 + x 1 + x / / ------------------------------------------------------------------------------------ 2 / 2\ \1 + x /