express argument in radians.
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z = 10 [ -√3 / 2 + i (-1/2) ] = 10 [ cos ( 7π / 6 ) + i sin ( 7π / 6 ) ] = 10 e^(i 7π / 6 )
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z = 10 [ -√3 / 2 + i (-1/2) ] = 10 [ cos ( 7π / 6 ) + i sin ( 7π / 6 ) ] = 10 e^(i 7π / 6 )