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If A={(x,y)|x^2+y^2 <= 4} and B={(x,y)|...

If `A={(x,y)|x^2+y^2 <= 4} and B={(x,y)|(x-3)^2+y^2 <= 4} and ` then point `P (alpha ,a-1/2)` belongs to the set B-A then the set of possible real values of `alpha` is

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