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[" 25."ABC" is a triangle,right angled at (a) The resultant of the "],[" forces acting along "AB" and "bar(AC)" with magnitudes "(1)/(|AB|)" and "],[(1)/(|AC|)" ,respectively,is the force along "vec AD," where "(1)/(|AB|)" and "],[" foot of the perpendicular from "A" onto "BC" .The magnitude "],[" of the resultant is "],[[" (a) "(AB^(2)+AC^(2))/((AB)^(2)(AC)^(2))," (b) "((AB)(AC))/(AB+AC)],[" (c) "(1)/(AB)+(1)/(AC)," (d) "(1)/(AD)," (AIEEE "2006)]]

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