cos(2*acos(x))
2*sin(2*acos(x)) ---------------- ________ / 2 \/ 1 - x
/2*cos(2*acos(x)) x*sin(2*acos(x))\ 2*|---------------- + ----------------| | 2 3/2 | | -1 + x / 2\ | \ \1 - x / /
/ 2 \ | sin(2*acos(x)) x *sin(2*acos(x)) 2*x*cos(2*acos(x))| 6*|- -------------- + ----------------- - ------------------| | 3/2 5/2 2 | | / 2\ / 2\ / 2\ | \ \1 - x / \1 - x / \-1 + x / /