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The image of the centre of the circle ...

The image of the centre of the circle `x^(2)+y^(2)=a^(2)` with respect to the mirror `x+y=1` is

A

`((1)/(sqrt(2)),sqrt(2))`

B

`(sqrt(2),sqrt(2))`

C

`(sqrt(2),2sqrt(2))`

D

None of these

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