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Consider four circles (x+-1)^2+(y+-1)^2=...

Consider four circles `(x+-1)^2+(y+-1)^2=1`. Find the equation of larger circle touching these four circles.

A

`x^2+y^2=(sqrt2+1)^2`

B

`x^2+y^2=(sqrt2-1)^2`

C

`x^2+y^2=(2-sqrt2)^2`

D

none of these

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The correct Answer is:
A
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