The magnitude of a complex number $a+bi$ is $\sqrt{a^2+b^2}$ and the argument is $\arctan(\frac{b}{a})$. So, the magnitude of $w$ and $z$ is $\sqrt{(-1)^2+1^2}=\sqrt{2}$ and the arguments are $135^\circ$ and $225^\circ$ respectively. Therefore,
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