I was going through some old work sheets and couldn't seem to do this one for some reason...
If find using the theorem of De Moivre.
What I did:
I assume I would find values for and and then I would be done right? Assuming this is what I am supposed to do, how do I solve for the angle ?
Thanks.
and .
So .
You have
You will need to use half angle identities to evaluate these exactly.
There is also another square root. You should know that square roots are evenly spaced about a circle, so these two square roots will have the same magnitude and are separated by an angle of , so the other square root is
and you should have those values from the first square root