Typical special functions defined in math.h, such as cos and sin, are either native primitive functions in FAUST or may be defined as foreign functions. See <faustlibraries_distribution>/maths.lib for the complete list already incorporated or predefined. The list of incorporated primitives is given in §3.5.3 (p. 32) of the FAUST Quick Reference,. All of these functions accept a signal and return a signal computed by applying the function to each sample.