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[" B and "C" are fixed points having co-ordinates "(3,0)" and "(-3,0)" respectively.If the vertical angle "BAC" is "9],[" then the locus of the centroid of the "/_ABC" has the equation "],[[" (A) "x^(2)+y^(2)=1," (B) "x^(2)+y^(2)=2," (C) "9(x^(2)+y^(2))=1," (D) "9(x^(2)+y^(2))=4]]

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