what is the cube root of 64i


a) 4 cis 30 degrees, 4 cis 150 degrees, 4 cis 270 degrees

b) 4 cis 60 degrees, 4 cis 180 degrees, 4 cis 300 degrees

c) 1, -1, -i

d) 4 cis 0 degrees, 4 cis 120 degrees, 4 cis 240 degrees