1.

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

Answer»

`{-2 , 2}`
`{- 3, 3}`
`{-4, 4}`
`{-5,5}`

ANSWER :A


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