Integration of complex numbers I was solving some integration questions, then one question arised in my mind that "Do the integration of complex no. possible?" 
If yes, then what is $\int i dx$? 
Definite integration is the area under curve of the graph but the above graph cannot be plotted on real plane. 
I want someone to please clear my doubts regarding integration. Thanks!!!

The simple answer is that $i$ is a constant, so $\int i \,dx = i x + C$
The more complete answer is that "area under curve of the graph" doesn't really make sense for what you are doing when you say $\int i \,dx$, you can integrate a complex variable $z=x +iy$ over a contour. I would check out contour integration here, it might explain things a little better. 
