/ pi\ sin(a) cos|a - --| - ------ \ 6 / 2
cos(a - pi/6) - sin(a)/2 при a = 3/2
cos(a - pi/6) - sin(a)/2
cos((3/2) - pi/6) - sin((3/2))/2
cos(3/2 - pi/6) - sin(3/2)/2
-sin(3/2)/2 + sin(3/2 + pi/3)
sin(a) / pi\ - ------ + sin|a + --| 2 \ 3 /
-0.5*sin(a) + cos(a - pi/6)
/ pi\ -sin(a) + 2*sin|a + --| \ 3 / ----------------------- 2
/-pi + 6*a\ -sin(a) + 2*cos|---------| \ 6 / -------------------------- 2
___ \/ 3 *cos(a) ------------ 2
sin(a) / pi\ - ------ + sin|a + --| 2 \ 3 /
/ pi\ -sin(a) + 2*sin|a + --| \ 3 / ----------------------- 2
sin(a) / pi\ - ------ + sin|a + --| 2 \ 3 /
___ \/ 3 *cos(a) ------------ 2