(a) express z in modulus-argument form
(b) express z in real-imaginary form
First Question: Do I need to expand out the top and bottom parts before doing anything else?
Edit: This is what I got for (b):
expanding the denominator out, we get (-2 + 2i)
multiplying by gives =
expanding out gives:
Any help for part (a) greatly appreciated!
I've been through Moo's workings, adding in the cube power he missed and got the following:
(using Moo's notation of x, y, & t)
which is ever-so-slightly different to what I got by expanding it all out.
What the hell am I doing wrong here?! I've spent 1/2 the morning going over this and just can't for the life of me see where I've gone wrong. Any help desperately appreciated!