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A square in inscribed in the circle x^(...

A square in inscribed in the circle `x^(2)+y^(2)-2 x+4 y-3=0 .` Its sides are paralltl to the coordinates axes. Then one of the vertex of the square is

A

`(1+sqrt(2),-2)`

B

`(1-sqrt(2),-2)`

C

`(1,-2+sqrt(2))`

D

none of these

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The correct Answer is:
D
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