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If x ,y in R satify the equation x^2+y...

If `x ,y in R` satify the equation `x^2+y^2-4x-2y+5=0,` then the value of the expression `[(sqrt(x)-sqrt(y))^2+sqrt(x y)]//(x+4sqrt(x y))` is `sqrt(2)+1` b. `(sqrt(2)+1)/2` c. `(sqrt(2)-1)/2` d. `(sqrt(2)+1)/(sqrt(2))`

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