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

Question

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

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Answer 1 · 2018-05-21T00:50:14

#-3/2+(3sqrt3)/2#

#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#