atan 25 maint/gnulib/lib/atanf.c return (float) atan ((double) x); atan 26 maint/gnulib/lib/atanl.c return atan (x); atan 24 maint/gnulib/tests/test-atan.c SIGNATURE_CHECK (atan, double, (double)); atan 36 maint/gnulib/tests/test-atan.c y = atan (x);