| cos | Function (ROM Call 0xF9*)

math.h, timath.h

float cos (float x);

Floating point cosine.

cos returns the cosine of floating point argument x, which is assumed to be specified in radians.
Note: cos will return NAN if the argument is so big that reducing to the main period can't be performed without complete losing of significant digits (i.e. when the magnitude of x is greater than 1e13).

Uses: trig
Used by: ccos, cexp, csin, ctan, cmd_sinreg