You need to make use of Euler's formula: .
May be its not the right place to ask this, but mods can move this to other parts of the forum(i encountered it while leaning diff equations)...
I would like to know how to find in trigonometric form or polar form, so please try to show all the steps.
It would also be very helpful if someone could post a link to learn converting complex exponentials to trignometric functions, or just how to find out the real part of the complex exponential in trignometric form.
Thanks