1. The problem statement, all variables and given/known data First off convert to z=(-i)1/3. Here is where I am stuck, how do I convert the above to this form: eiθ? I am mainly stuck because I don't know how to solve for theta. I know that θ = arctan(y/x) where y is the coefficient in front of i and x is the real value but in this case there is no x... So you would be dividing by zero which doesn't make sense.