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[" 27.Two perpendicular tangents to the circle "x^(2)+y^(2)=a^(2)" meet "],[" at "P" .Then the locus of "P" has the equation "],[[" (a) "x^(2)+y^(2)=2a^(2)," (b) "x^(2)+y^(2)=3a^(2)],[" (c) "x^(2)+y^(2)=4a^(2)," (d) none of these "]]

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