Answer depends on the conventions of your textbook: -3i=|z|(cos(alpha)+i*sin(alpha))=3(cos(-pi/2)+i*sin(-pi/2)) is expressed in trigonometric form when a polar angle ranges from -pi to pi; -3i=|z|(cos(alpha)+i*sin(alpha))=3(cos(3*pi/2)+i*sin(3*pi/2)) is expressed in trigonometric form when a polar angle ranges from 0 to 2*pi.
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