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It's got nothing to do with C. The math library is a library supplied with your compiler. Therefore, you need to check the library documentation that your compiler vendor must have supplied to you. This link may help you if you search on Algorithm, and Math.
I didn't download the doc to confirm.
The compiler's Math Library contains all of the math functions it supports. It may, or may not, contain all of the functions listed in the Standard C Math Library, so you have to check it's documentation to see which functions it provides. For details on the Standard C Math Library functions check out this Wikipedia entry: