al_fixcos - Allegro 5 API

       This  function  finds  the cosine of a value using a lookup table.  The input value must be a fixed point
       binary angle.

       Example:

              al_fixed angle;
              float result;

              /* Set the binary angle to 45 degrees. */
              angle = al_itofix(32);

              /* The cosine of 45 degrees is about 0.7071. */
              result = al_fixtof(al_fixcos(angle));
              assert(result > 0.7 && result < 0.71);

       al_fixcos - Allegro 5 API

       Returns the cosine of a fixed point binary format angle as a fixed point value.

Allegro reference manual                                                                      al_fixcos(3alleg5)

              #include <allegro5/allegro.h>

              al_fixed al_fixcos(al_fixed x);