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Q: How to take an expr from Hold[expr] wrap without evaluate it?
Hi, I have an expression variable wrapped in the Hold or HoldComplete function such as expr = HoldComplete[Sin[x]\[DifferentialD]x]] where Sin[x]\[DifferentialD]x is a sympolic expression variable. How can I take the it out without evaluate it? I have tried the Expr = ReleaseHold[Unevaluated[ expr]] or Expr = FullSimplify[ expr] and so on without success. All I wanted is the simple symbolic expression. Thanks in advance. Any help is greatly appreciated. X.Jing