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The equation of the circle in the first ...

The equation of the circle in the first quadrant touching each coordinate axis at a distance of one unit from the origin is

A

`x^(2) +y^(2) - 2x - 2y +1 = 0`

B

` x^(2) +y^(2) - 2x - 2y - 1=`0

C

`x^(2) +y^(2) - 2y - 2x - 2y = 0 `

D

None of these

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The correct Answer is:
A
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