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| [mcode]f = (m - h)^2/(k^2 + m^2 - m*h) /. h -> Sqrt[k^2 + m^2]; g = FullSimplify[f]; lhs = FullSimplify[Limit[f, k -> 0]]; rhs = FullSimplify[Limit[g, k -> 0]]; thereisadifference = Not[lhs === rhs]; InputForm[{lhs, rhs,... |