Question 1197763
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A and B are equivalent because the magnitudes are opposite and the angles differ by pi radians.<br>
C is equivalent to A because the magnitudes are the same and the angles differ by 2pi.<br>
E is equivalent to B because the magnitudes are the same and the angles differ by 2pi.<br>
D is NOT equivalent to B because the magnitudes are the same and the angles differ by pi/3.<br>
So A, B, C, and E are equivalent; D is different.<br>
But NONE of them are equivalent to (2,sqrt(3)).  That point is in quadrant I; D is in quadrant III and the others are in quadrant IV.<br>
The statement of the problem is faulty.<br>