Question

Write z=4 cis 2 pi/3 in standard form.

a.) 2 sqrt 3+2i
b.) -2+2i sqrt 3
c.) 2 sqrt 3-2i
d.) 2+2i sqrt 3

Answer 1

is the answer b?
z=4(cos2pi/3+isin2pi/3)
z=4cos2pi/3 +4isin2pi/3
if you put it into the calculator it becomes -2+2i sqrt3

Answer 2

yes