General simplification
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$$\frac{1}{4}$$
/ / pi\ / pi\\ / / pi\ / pi\\
2 | I*|a - --| I*|-a + --|| | I*|a + --| I*|-a - --||
/ -I*a I*a\ | \ 3 / \ 3 /| | \ 3 / \ 3 /|
\- e + e / |e e | |e e |
- ----------------- + |----------- + ------------|*|----------- + ------------|
4 \ 2 2 / \ 2 2 /
$$- \frac{\left(e^{i a} - e^{- i a}\right)^{2}}{4} + \left(\frac{e^{i \left(- a - \frac{\pi}{3}\right)}}{2} + \frac{e^{i \left(a + \frac{\pi}{3}\right)}}{2}\right) \left(\frac{e^{i \left(- a + \frac{\pi}{3}\right)}}{2} + \frac{e^{i \left(a - \frac{\pi}{3}\right)}}{2}\right)$$
2 / pi\ / pi\
sin (a) + cos|a + --|*sin|a + --|
\ 3 / \ 6 /
$$\sin^{2}{\left(a \right)} + \sin{\left(a + \frac{\pi}{6} \right)} \cos{\left(a + \frac{\pi}{3} \right)}$$
sin(a)^2 + cos(a + pi/3)*sin(a + pi/6)
2 / pi\ / pi\
sin (a) + cos|a + --|*sin|a + --|
\ 3 / \ 6 /
$$\sin^{2}{\left(a \right)} + \sin{\left(a + \frac{\pi}{6} \right)} \cos{\left(a + \frac{\pi}{3} \right)}$$
sin(a)^2 + cos(a + pi/3)*sin(a + pi/6)
2 / pi\ / pi\
sin (a) + cos|a + --|*sin|a + --|
\ 3 / \ 6 /
$$\sin^{2}{\left(a \right)} + \sin{\left(a + \frac{\pi}{6} \right)} \cos{\left(a + \frac{\pi}{3} \right)}$$
sin(a)^2 + cos(a + pi/3)*sin(a + pi/6)
sin(a)^2 + cos(pi/3 + a)*cos(pi/3 - a)
sin(a)^2 + cos(pi/3 + a)*cos(pi/3 - a)
Rational denominator
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2 / pi\ / pi\
sin (a) + cos|a + --|*cos|a - --|
\ 3 / \ 3 /
$$\sin^{2}{\left(a \right)} + \cos{\left(a - \frac{\pi}{3} \right)} \cos{\left(a + \frac{\pi}{3} \right)}$$
sin(a)^2 + cos(a + pi/3)*cos(a - pi/3)
Combining rational expressions
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2 /pi - 3*a\ /pi + 3*a\
sin (a) + cos|--------|*cos|--------|
\ 3 / \ 3 /
$$\sin^{2}{\left(a \right)} + \cos{\left(\frac{\pi - 3 a}{3} \right)} \cos{\left(\frac{3 a + \pi}{3} \right)}$$
sin(a)^2 + cos((pi - 3*a)/3)*cos((pi + 3*a)/3)
2 2
cos (a) sin (a)
------- + -------
4 4
$$\frac{\sin^{2}{\left(a \right)}}{4} + \frac{\cos^{2}{\left(a \right)}}{4}$$