1.

A pair of perpendicular straight lines passes through the origin and also through the point of intersection of the curve x2+y2 =4 with x+y=a. The set containg the value of 'a' is

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A pair of perpendicular straight lines passes through the origin and also through the point of intersection of the curve x2+y2 =4 with x+y=a. The set containg the value of 'a' is




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