/ 2\ acos\(2*x) /
-8*x -------------- ___________ / 4 \/ 1 - 16*x
/ 4 \ | 32*x | -8*|1 + ---------| | 4| \ 1 - 16*x / ------------------ ___________ / 4 \/ 1 - 16*x
/ 4 \ 3 | 96*x | -256*x *|5 + ---------| | 4| \ 1 - 16*x / ----------------------- 3/2 / 4\ \1 - 16*x /