and hence that
I have done the first part and am going round in circles trying to show the second part, I was trying to make use of de moivre's theorem but to no avail. Please help.
Trying to solve the second problem, I made a few manipulations, but I've seemed to arrive at a contradiction.
which only holds if the real and imaginary parts are equivalently 0. But because is not, it's weird. My calculator says that I'm wrong.