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[" A point moves in a plane so that its ...

[" A point moves in a plane so that its distances "PA" and "PB" from two fixed points "A" and "B" in "],[" the plane satisfy the relation "PA-PB=k(k!=0)" ,then the locus of "P" is "],[[" (a) a hyperbola "," (b) a branch of the hyperbola "],[" (c) a parabola "," (d) an ellipse "]]

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