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| I am trying to evaluate an expression using "Abs" but for some reason it does not simplify beyond a point. Am I doing something wrong in here? My command is: Refine[Abs[k1*I + 1], Element[k1, PositiveReals]] The output I am getting: ... |
| I am trying to evaluate: > Expand[D[x[t], {t, 2}] + (x[t])^3 /. x[t] -> A sin[\[Omega]t]] in Mathematica. However, I get the following output: > A^3 sin[\[Omega]t]^3 + (x^\[Prime]\[Prime])[t] whereas I am expecting and output where x''[t]... |