216*(1 - 6*x*atan(6*x))*atan(6*x) --------------------------------- 2 / 2\ \1 + 36*x /
/ 2 2 \ | 1 2 36*x*atan(6*x) 144*x *atan (6*x)| 1296*|--------- - atan (6*x) - -------------- + -----------------| | 2 2 2 | \1 + 36*x 1 + 36*x 1 + 36*x / ------------------------------------------------------------------ 2 / 2\ \1 + 36*x /