(0.33cos0,0.33sin0)=(0.33,0)
(0.111cos120°,0.111sin120°)=(-0.0555,0.0961)
(0.33,0)-(-0.0555,0.0961)
=(0.33+0.0555,0-0.0961)
=(0.3855,-0.0961)
√[0.3855^2+(-0.0961)^2]=0.3973
arctan(-0.0961)/0.3855
=-14°
0.33∠0°-0.111∠120°=0.3973∠-14°
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