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Change integral variables
In Mathematica, how can I change integral variables? For example in integration: Integrate[Sin[Sqrt[x]], x] if I want to use t^2=x to instead x in the integral, how can I achieve this? PS: Does Mathematica have a inertial form of some symbolic command, for instance, the above integration, if I only want an integration form but not an answer, what can I do? Thanks.