I am using DeMoivre's Theorem to find the 6th power of the complex number (2+3i). I start by putting the complex number in trig form, but am having trouble with the angle. I have r=sqrt(13), and tan0=3/2. The solution guide has an angle for this tan, but I can not determine how to get it. Also the angle they get is then used as a reference angle. I thought I could use tan(3/2) and then use that value with arctan to find the angle but it is not working.