-cos(a)*cos(270 + a)*tan(90 + a)
---------------------------------
cos(-180 + a)*sin(-270 + a)
−sin(a−270)cos(a−180)cos(a)cos(a+270)tan(a+90)
/ I*a -I*a\ / I*(-270 - a) I*(270 + a)\
|e e | |e e | / I*(90 + a) I*(-90 - a)\
2*|---- + -----|*|------------- + ------------|*\- e + e /
\ 2 2 / \ 2 2 /
--------------------------------------------------------------------------------------------
/ I*(-180 + a) I*(180 - a)\
|e e | / I*(270 - a) I*(-270 + a)\ / I*(-90 - a) I*(90 + a)\
|------------- + ------------|*\- e + e /*\e + e /
\ 2 2 /
(2ei(180−a)+2ei(a−180))(−ei(270−a)+ei(a−270))(ei(−a−90)+ei(a+90))2(2eia+2e−ia)(2ei(−a−270)+2ei(a+270))(ei(−a−90)−ei(a+90))
2*(exp(i*a)/2 + exp(-i*a)/2)*(exp(i*(-270 - a))/2 + exp(i*(270 + a))/2)*(-exp(i*(90 + a)) + exp(i*(-90 - a)))/((exp(i*(-180 + a))/2 + exp(i*(180 - a))/2)*(-exp(i*(270 - a)) + exp(i*(-270 + a)))*(exp(i*(-90 - a)) + exp(i*(90 + a))))