ref: ac1a4e7dbe0b0c96054aee63bdd167636e857b85
dir: /posix/math.h/
float cosf(float); float sinf(float); float tanf(float); float atanf(float); float atan2f(float, float); float fabsf(float); float sqrtf(float); float acosf(float); float floorf(float); float ceilf(float); float fmodf(float, float);