Forms of Complex Numbers Q8

Forms of Complex Numbers Q8

Express the following complex numbers in the form \(z = r e^{\mathbf{i}\theta}\) where \(r \ge 0\), and \(-\pi < \theta \le \pi\).

  1. \(3\mathrm{i}e^{-\mathbf{i}\pi}\)
  2. \(-2e^{-\mathbf{i}\frac{\pi}{3}}\)
  3. \(e^{1-\mathbf{i}\frac{\pi}{3}}\)
  4. \(\left( \sqrt{3}-\mathbf{i} \right)e^{-\mathbf{i}\frac{\pi}{4}}\)
  5. \(-2\left( 1+\sqrt{3}\mathbf{i} \right)e^{\mathbf{i}\frac{2\pi}{5}}\)

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Answer:(a) \( 3e^{-i\frac{\pi}{2}} \); (b) \( 2e^{i\frac{2\pi}{3}} \); (c) \( ee^{-i\frac{\pi}{3}} \); (d) \( 2e^{-i\frac{5\pi}{12}} \); (e) \( 4e^{-i\frac{4\pi}{15}} \)

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