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[" If the focus of a parabola is "(-2,1)...

[" If the focus of a parabola is "(-2,1)" and the directrix has the equation "x+y=3" ,then its "],[" vertex is "],[" (b) "(-1,1/2)],[" (c) "(-1,2)],[" (d) "(2,-1)],[(0,3)]

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