The polar form is = r * ( cos(a) + i*sin(a) ),
where "r" is the polar radius and "a" is the polar angle.
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So, our goal is to find the polar radius r and the polar angle "a".
r = = = = = 2.
tan(a) = = = = .
Therefore, a = ( taking into account that the angle "a" is in QIII ).
Thus the polar form is, finally, = = (2, ) = . ANSWER