/ 2\ acos\t*x /
-2*t*x -------------- ___________ / 2 4 \/ 1 - t *x
/ 2 4 \ | 2*t *x | -2*t*|1 + ---------| | 2 4| \ 1 - t *x / -------------------- ___________ / 2 4 \/ 1 - t *x
/ 2 4 \ 3 3 | 6*t *x | -4*t *x *|5 + ---------| | 2 4| \ 1 - t *x / ------------------------ 3/2 / 2 4\ \1 - t *x /