atan               49 ext/date/lib/astro.c #define atand(x)    (RADEG*atan(x))
atan             2880 ext/standard/basic_functions.c 	PHP_FE(atan,															arginfo_atan)
atan              462 ext/standard/math.c PHP_FUNCTION(atan)
atan              469 ext/standard/math.c 	RETURN_DOUBLE(atan(num));
atan               37 ext/standard/php_math.h PHP_FUNCTION(atan);