Question
If $\sqrt{(x+i y)}=\pm(a+i b)$, then $\sqrt{-x-i y}$ is equal to(a) $\pm(\mathrm{b}+\mathrm{ia})$(b) $\pm(a-i b)$(c) $\pm(\mathrm{ai}-\mathrm{b})$(d) $\pm(-b-i a)$
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