acos               51 ext/date/lib/astro.c #define acosd(x)    (RADEG*acos(x))
acos             2889 ext/standard/basic_functions.c 	PHP_FE(acos,															arginfo_acos)
acos              510 ext/standard/math.c PHP_FUNCTION(acos)
acos              523 ext/standard/math.c 	RETURN_DOUBLE(acos(num));
acos               36 ext/standard/php_math.h PHP_FUNCTION(acos);