As part of this philosophy, there are no build in scientific functions, or interfaces between the program and the operating system. If you want to use a standard library there will certainly be one step, and perhaps two, that need to be done first. The first step that must certainly be done is to include the header file for the standard library.
Examples are math.h or stdio.h.
The libraries use most often are listed below. It does not necessarily also tell the linker how to find the executable for the libraries. In this case you need to add an option something like -lmath to tell it which library to link into.