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If (x+iy)^(1//3)=a+ib,"where"i=sqrt(-1),...

If `(x+iy)^(1//3)=a+ib,"where"i=sqrt(-1),then ((x)/(a)+(y)/(b))` is equal to

A

`4a^(2)b^(2)`

B

`4(a^(2)-b^(2))`

C

`4a^(2)-b^(2)`

D

`a^(2)+b^(2)`

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