I need some help on a problem which seems simple...
I'm doing as follows:
restart; with(LinearAlgebra); with(plots):
II[C] := proc (delta) options operator, arrow; 230/(84192.96489-230*cos(delta)+(-1)*4128.950345*sin(delta)) end proc
(sorry for the formatting)
plot(II[C](delta), delta = -Pi .. Pi)
(This works just fine and produces a nice plot, then I continue)
f1 := plot(II[C](delta), delta = -Pi .. Pi)
(This doesn't work! But gives me this result)
What have I done wrong?
Therefore I can't include it into a display command and add together with other plots!
Plz help me quick.