Complex Numbers (id: 71f79c8da)

本题目来源于试卷: Complex Numbers，类别为 IB数学

[问答题]
Let $z=2+\mathrm{i}$ and w=1-2 $\mathrm{i}$ .
1. Find z w .
2. Illustrate z, w and z w on the same Argand diagram.
3. Let $\theta$ be the angle between z w and w . Find $\theta $, giving your answer in radians.

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