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[" The equation of an ellipse whose focus is "],[(-1,1)" ,directrix is "x-y+3=0" and "],[" eccentricity is "(1)/(2)," is given by "],[[" (A) "7x^(2)+2xy+7y^(2)+10x-10y+7=0],[" (B) "7x^(2)-2xy+7y^(2)-10x+10y+7=0],[" (C) "7x^(2)-2xy+7y^(2)-10x-10y-7=0],[" (D) "7x^(2)-2xy+7y^(2)+10x+10y-7=0]]

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