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Tangent to the circle x^2+y^2=a^2 at any...

Tangent to the circle `x^2+y^2=a^2` at any point on it in the first quadrant makes intercepts `O A` and `O B` on `x` and `y` axes respectively, `O` being the centre of the circle. Find the minimum value of `O A+O B` .

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