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Square roots of $-i$,where $i=\sqrt{-1}$, are

- $i,-i$
- $cos(-\frac{\pi }{4} )+isin(-\frac{\pi }{4})+cos(\frac{3\pi }{4})+isin(\frac{3\pi }{4})$
- $cos(\frac{\pi }{4} )+isin(\frac{3\pi }{4})+cos(\frac{3\pi }{4})+isin(\frac{\pi }{4})$
- $cos(\frac{3\pi }{4} )+isin(-\frac{3\pi }{4})+cos(-\frac{3\pi }{4})+isin(\frac{3\pi }{4})$

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