1. The problem statement, all variables and given/known data How do I write 1-2i in polar form? 2. Relevant equations 3. The attempt at a solution I know r=√5, and when using x=rcosθ, I get angle of 63.43 or 296.57. However, when I take the sin inverse of-2/√5 I get -63.43. I am really confused.