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The circle x^2+y^2=1 cuts the x-axis at ...

The circle `x^2+y^2=1` cuts the x-axis at `Pa n dQdot` Another circle with center at `Q` and variable radius intersects the first circle at `R` above the x-axis and the line segment PQ at S. Find the maximum area of triangle QSR.

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C, D
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