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[" A.D and "E" are points on sides "AB" and "AC" respectively of "/_ABC" such that "],[ar" DBC ")=ar(EBC)" .Prove that DEIIBC."],[" XY is a line parallel to side "BC" of atriangle ABC.If BEIIAC and C riliAB meet XY at "E],[" and F respectively,show that "]

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