Please help with this question. I'm really having trouble. Let z= r(cosa+isina) be any complex number. a. Show that lz^2l = lzl^2 (I know how to prove this question, but I just put this down because I'm assuming you'd need it for the following questions) b. For which (if any) complex numbers is Re(z^2) = (Rez)^2 c. For which (if any) complex numbers is Im(z^2) = (Imz)^2 I tried solving b. and I ended up with an answer involving "cos". Any help would be greatly appreciated.