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9709 P31 - Nov 2014 - Q5
1985

The complex numbers w and z satisfy the relation

\(w = \frac{z + i}{iz + 2}\).

(i) Given that \(z = 1 + i\), find \(w\), giving your answer in the form \(x + iy\), where \(x\) and \(y\) are real.

(ii) Given instead that \(w = z\) and the real part of \(z\) is negative, find \(z\), giving your answer in the form \(x + iy\), where \(x\) and \(y\) are real.

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