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If sqrt(a+i b)=x+i y ,\ then possible v...

If `sqrt(a+i b)=x+i y ,\ ` then possible value of `sqrt(a-i b)` is a. `x^2+y^2` b. `sqrt(x^2+y^2)` c. `x+i y` d. `x-i y` e. `sqrt(x^2-y^2)`

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