/ 3*cos(x) 3*cos(2*x)\
/ ___\ / ___\ 6*|- -------- + ----------|
| 3*\/ 3 | | 3*\/ 3 | \ 2 8 /
|-1 + -------|*sin(2*x) + |2 + -------|*sin(x) + ---------------------------
\ 4*pi / \ pi / pi
$$\frac{6 \left(- \frac{3 \cos{\left(x \right)}}{2} + \frac{3 \cos{\left(2 x \right)}}{8}\right)}{\pi} + \left(\frac{3 \sqrt{3}}{\pi} + 2\right) \sin{\left(x \right)} + \left(-1 + \frac{3 \sqrt{3}}{4 \pi}\right) \sin{\left(2 x \right)}$$
(-1 + 3*sqrt(3)/(4*pi))*sin(2*x) + (2 + 3*sqrt(3)/pi)*sin(x) + 6*(-3*cos(x)/2 + 3*cos(2*x)/8)/pi