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2022 MMATHS Individual p11 - Im(1/w)=Im(k/w^2)=Im(k/w^3) complex

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October 1, 2023
MMATHScomplex numbersalgebra

Problem Statement

Denote by Re(z)Re(z) and Im(z)Im(z) the real part and imaginary part, respectively, of a complex number zz; that is, if z=a+biz = a + bi, then Re(z)=aRe(z) = a and Im(z)=bIm(z) = b. Suppose that there exists some real number kk such that Im(1w)=Im(kw2)=Im(kw3)Im \left( \frac{1}{w} \right) = Im \left( \frac{k}{w^2} \right) = Im \left( \frac{k}{w^3} \right) for some complex number ww with w=32||w||=\frac{\sqrt3}{2} , Re(w)>0Re(w) > 0, and Im(w)0Im(w) \ne 0. If kk can be expressed as abc\frac{\sqrt{a}-b}{c} for integers aa, bb, cc with aa squarefree, find a+b+ca + b + c.