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Please answer this:1+7 =

Original Message (ID '427770') By Bill Simpson:
Try f[x_, y_, w_, z_] := Sqrt[(x-y)^2 + (w-z)^2]; v = Integrate[f[x, y, w, z], y] and then v /. y->3 - v /. y->2 and see if that works for you. If so then be cautious about whether that last step is mathematically justified in all cases.