acos(x) + b*sin(x)
d --(acos(x) + b*sin(x)) dx
1 - ----------- + b*cos(x) ________ / 2 \/ 1 - x
/ x \ -|b*sin(x) + -----------| | 3/2| | / 2\ | \ \1 - x / /
/ 2 \ | 1 3*x | -|----------- + b*cos(x) + -----------| | 3/2 5/2| |/ 2\ / 2\ | \\1 - x / \1 - x / /