How do you write the following complex number in rectangular form?

3(cos(120)+isin(120))

1 Answer
May 21, 2018

-3/2+(3sqrt3)/2

Explanation:

3(cos(120^@)+isin(120^@))

Distribute:
3*cos(120^@)+3*isin(120^@)

Recall the unit circle coordinates:
3*-1/2+3*sqrt3/2

-3/2+(3sqrt3)/2