/ pi \ / pi\ / 3*pi\
cot|-----|*sin|a + --|*sin|a + ----|
\2 + a/ \ 5 / \ 10 /
------------------------------------
cot(a)
cot(a)sin(a+5π)sin(a+103π)cot(a+2π)
/ / 3*pi\ / 3*pi\\ / / pi\ / pi\\
| I*|-a - ----| I*|a + ----|| | I*|-a - --| I*|a + --||
| \ 10 / \ 10 /| | \ 5 / \ 5 /| / pi \
-\- e + e /*\- e + e /*cot|-----|
\2 + a/
------------------------------------------------------------------------------
4*cot(a)
−4cot(a)(−ei(−a−103π)+ei(a+103π))(−ei(−a−5π)+ei(a+5π))cot(a+2π)
-(-exp(i*(-a - 3*pi/10)) + exp(i*(a + 3*pi/10)))*(-exp(i*(-a - pi/5)) + exp(i*(a + pi/5)))*cot(pi/(2 + a))/(4*cot(a))