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If z = x + iy and roots zbarz^(3) + bar...

If z = x + iy and roots ` zbarz^(3) + barz z^(3) = 30` are the vertices of a rectangle and ` z_(0)` is centre of rectangle. Let d be distance of ` z_(0)` form the point on circle |z-3| `ge ` 2 then maximum value of d is ________

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