De moivre’s theorem and its applications - class-XII

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Multiple Choice

If $iz^4 + 1 = 0$, then z can take the value

  1. $\displaystyle \frac{1 + i}{\sqrt 2}$
  2. $\cos \displaystyle \frac{\pi}{8} + i \sin \frac{\pi}{8}$
  3. $\displaystyle \frac{1}{4 i}$
  4. $i$
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