acos               25 maint/gnulib/lib/acosf.c   return (float) acos ((double) x);
acos               39 maint/gnulib/lib/acosl.c   return acos (x);
acos               24 maint/gnulib/tests/test-acos.c SIGNATURE_CHECK (acos, double, (double));
acos               36 maint/gnulib/tests/test-acos.c   y = acos (x);