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Area of the quadrilateral formed with th...

Area of the quadrilateral formed with the foci of the hyperbola `x^2/a^2-y^2/b^2=1 and x^2/a^2-y^2/b^2=-1` (a) `4(a^2+b^2)` (b) `2(a^2+b^2)` (c) `(a^2+b^2)` (d) `1/2(a^2+b^2)`

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