/ 3\ acos\x /
2 -3*x ----------- ________ / 6 \/ 1 - x
/ 6 \ | 3*x | -3*x*|2 + ------| | 6| \ 1 - x / ----------------- ________ / 6 \/ 1 - x
/ 6 12 \ | 27*x 27*x | -3*|2 + ------ + ---------| | 6 2| | 1 - x / 6\ | \ \1 - x / / --------------------------- ________ / 6 \/ 1 - x