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[" Two perpendicular tangents to the circle "x^(2)+y^(2)=],[a^(2)" meet at "P" .Then the locus of "P" has the "],[" equation: "],[[" (1) "x^(2)+y^(2)=2a^(2)," (2) "x^(2)+y^(2)=3a^(2)],[" (3) "x^(2)+y^(2)=4a^(2)," (4) "x^(2)+y^(2)=5a^(2)]]

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