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The figure shows a fixed circle C1 with ...

The figure shows a fixed circle `C_1` with equation `(x-1)^2 +y^2 = 1` and a shrinking circle `C_2` with radius r and centre at the origin. P is the point `(0,r)`, Q is the upper point of intersection of the two circles and R is the point of intersection of the line PQ and the x-axis. The coordinates of the point R as C, shrinks ie. as `r->0` is

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