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Two circles of radii aa n db touching ea...

Two circles of radii `aa n db` touching each other externally, are inscribed in the area bounded by `y=sqrt(1-x^2)` and the x-axis. If `b=1/2,` then `a` is equal to `1/4` (b) `1/8` (c) `1/2` (d) `1/(sqrt(2))`

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