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>>> from cmath import *
>>> from math import *
>>> i12 = rect(1,radians(30))
>>> i31 = rect(2,radians(30+120))
>>> polar(i12-i31)
(2.6457513110645907, -0.19012560334646672)
>>> degrees(-0.1901)
-10.891927685436949
>>> L1a = sqrt(3)
>>> L1b = i12-i31
>>> polar(L1a + L1b)
(4.358898943540673, -0.11496092050070646)
>>> i12 = rect(2,radians(30))
>>> i21 = rect(2,radians(30-120))
>>> i31 = rect(3,radians(30+120))
>>> polar(i12-i31)
(4.358898943540674, -0.11496092050070641)
>>> polar(i21-i12)
(3.4641016151377544, -2.0943951023931953)
>>> polar(i31-i21)
(4.358898943540673, 2.209356022893902)
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