so you have

can you convert it to the form

i mean the numerator without the power and the denominator also without the power, then apply de moivre's theorem..

for the numerator part:

and r=2

for the denominator:

then apply the theorem on each:

also, apply the laws of addition and multiplication/division of complex numbers..

hmm, is that z^n

aww, i got i wrong conclusion..