/ 1 \ -9*|--------- + 6*x| \atan(3*x) / --------------------- 2 / 2\ \1 + 9*x / *atan(3*x)
/ 2 \ | 1 36*x 9*x | 54*|-1 + --------------------- + -------- + --------------------| | / 2\ 2 2 / 2\ | \ \1 + 9*x /*atan (3*x) 1 + 9*x \1 + 9*x /*atan(3*x)/ ----------------------------------------------------------------- 2 / 2\ \1 + 9*x / *atan(3*x)