/ pi\ / pi\ cos|2*t + --| + cos|6*t + --| \ 4 / \ 4 /
cos(2*t + pi/4) + cos(6*t + pi/4)
/pi + 8*t\ /pi + 24*t\ cos|--------| + cos|---------| \ 4 / \ 4 /
___ ___ ___ ___ \/ 2 *cos(2*t) \/ 2 *cos(6*t) \/ 2 *sin(2*t) \/ 2 *sin(6*t) -------------- + -------------- - -------------- - -------------- 2 2 2 2