I have tried to square the first equation and get,
and i can't seem to go any further from here, any help appreciated.
1) Z is the complex number
a) State the value of , hence show that for all
b) use the formula for the sum of a geometric series to show that
c) Let show that . Also show that and hence find an expression for in surd form.
i have done all parts except part c, am stuck on that bit
my solutons for a and b
recognising z as an 5th root of unity?