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A pair of perpendicular straight lines passes through the origin and also through the point of intersection of the curve $x^2+y^2=4$ with $x+y=a$. The set containing the value of 'a' is

\[\begin {array} {1 1} (1)\;\{-2,2 \} & \quad (2)\;\{-3,3\} \\ (3)\;\{-4,4\} & \quad (4)\;\{5,5\} \end {array}\]
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(1) {-2,2}
answered Nov 7, 2013 by pady_1

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