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The circle x^(2)+y^(2)=1 cats the X - ax...

The circle `x^(2)+y^(2)=1` cats the X - axis at P and Q. Another circle with centre at Q and veriable radius intersects the first circle at R above the X - axis and the line segment PQ at S. Find the maximum area of the triangle QSR.

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The correct Answer is:
`(4)/(3sqrt(3))`
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