Author 
Comment/Response 
jf

05/11/13 6:57pm
I guessed that by i you meant I (=Sqrt[1]) and added some mild Assumptions, but that wasn't enough.
Integrate[(2 I c^2 F2 (Cos[(x (L  l))/(2 c)] 
Sin[(x (L 
l))/(2 c)]))/(x (T x Sin[(x (L  3 l))/(2 c)] + (2 I c +
T x) Sin[(x (L + l))/(2 c)])), x,
Assumptions > {Element[{c, F2, x, L, T, l}, Reals]}]
URL: , 
