sin(atan(x))
1 ----------- 3/2 / 2\ \1 + x /
-3*x ----------- 5/2 / 2\ \1 + x /
/ 2 \ | 5*x | 3*|-1 + ------| | 2| \ 1 + x / --------------- 5/2 / 2\ \1 + x /