It is pretty simple. You have to put the "mathe.h" file in your include folder of your compiler. Then you have to open your IDE and link the library "libmathe.a". If you code, simple write "#include <mathe.h>" to implement the library.
I programmed this just for education. Actually, there is a much better library already implemented in your compiler. But I'm still working on it :D
Just read the "API.txt" file for more information!