getting header files from this site

sorry its late and im really new at this. I'm taking a C programming class and my professor got math.h from this site for use in his code. But I have looked all throughout this website and could not find anything related to any kind of download link for the C library.

I click the C library, and I see examples of the functions contained withing in, and I can click those functions to get a specific view of what they do, But I do not see anything resembling any kind of download link or code that I can copy and paste to get these functions.

Am I blind or are they really that well hidden? haha thanks
I think I get it, these are all things that are already included in all compilers right?
Yes, they generally are.
Cool! the way my teacher explained the site, made it seemed like you had to download this C library from here and add it to a header file to recieve those function.

But we installed something called mingw and they never really explained it, but after doing some searching I found it was all there.

Haha sorry for my stupidity
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