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A force F1=Aj is applied to a point whos...

A force `F_1=Aj` is applied to a point whose radius vector `r_1=ai`, while a force `F_2=Bi` is applied to the point whose radius vector `r_2=bj`. Both radius vectors are determined relative to the origin of coordinates O, i and j are the unit vectors of the x and y axes, a, b, A, B are constants. Find the arm l of the resultant force relative to the point O.

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