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If (x-2)^2+(y-2)^2=1, then which of th...

If `(x-2)^2+(y-2)^2=1,` then which of the following is true? a.maximum value of `x+y` is `4+sqrt(2)` b.maximum value of `x-y` is `sqrt(2)` c.maximum value of `x y` is `(9+4sqrt(2))/2` d.minimum value of `x+y` is `4-sqrt(2)`

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