/ I*(-a - b - c) I*(a + b + c)\
-4*\- e + e /
--------------------------------------------------
/ -I*a I*a\ / -I*b I*b\ / -I*c I*c\
\- e + e /*\- e + e /*\- e + e /
−(eia−e−ia)(eib−e−ib)(eic−e−ic)4(−ei(−a−b−c)+ei(a+b+c))
sin(a + b + c)
--------------------
sin(a)*sin(b)*sin(c)
sin(a)sin(b)sin(c)sin(a+b+c)
sin(a + b + c)/(sin(a)*sin(b)*sin(c))