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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.


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