# Integration problem with e^(ix)

1. Sep 5, 2011

### Mr Cheese

So I basically want to integrate this expression

$\int\sqrt{1 - e^{(aix)}}$

where a is some general term and i = $\sqrt{-1}$

I thought maybe of converting it to a single complex number in polar form and then just halfing the angle to get rid of the root, but i really have no idea how to go about this problem.

2. Sep 5, 2011

### jackmell

Just treat the complex constant as just a regular constant, say call it k=ia and when you finally get the answer, back-subsitute what k is. Then write:

$$\int \sqrt{1-e^{kx}}$$

You can do that huh? Takes several substitutions unless someone has a better way. So what happens if you start the first one by letting:

u=1-e^{kx}

Last edited: Sep 5, 2011