How to find root built-in function?

ROOT
1

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Hello,
I am wondering how to find the root built-in function? Like gaus and pol5? I want to see the concrete expression,thanks

ROOT Version: Not Provided
Platform: Not Provided
Compiler: Not Provided

2

https://root.cern/root/htmldoc/guides/users-guide/FittingHistograms.html#the-tf1-function-class

3

Thank you very much! And do you know the code for the fit function save? I want to look into the macro if possible.

4 
TF1::InitStandardFunctions();
gROOT->GetListOfFunctions()->ls();
gROOT->GetFunction("gaus")->Print();
gROOT->GetFunction("pol5")->Print();
5

Thank you very much!