If \( \sqrt{x+i y}=\pm(a+i b) \), then \( \sqrt{-x-i y} \) is equal to (A) \( \pm(b+i a) \) (B) ...

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If \( \sqrt{x+i y}=\pm(a+i b) \), then \( \sqrt{-x-i y} \) is equal to
(A) \( \pm(b+i a) \)
(B) \( \pm(a-i b) \)
(C) \( \pm(b-i a) \)
(D) \( \pm(a+i b) \)
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