atan(3*x) - sin(2*x)
atan(3*x) - sin(2*x)
3 -2*cos(2*x) + -------- 2 1 + 9*x
/ 27*x \ 2*|2*sin(2*x) - -----------| | 2| | / 2\ | \ \1 + 9*x / /
/ 2 \ | 27 972*x | 2*|- ----------- + 4*cos(2*x) + -----------| | 2 3| | / 2\ / 2\ | \ \1 + 9*x / \1 + 9*x / /