<html><body>// Invalid calculation will return a NaN value$x = acos(8);var_dump($x); </body><!-- Mirrored from www.w3schools.com/php/phptryit.asp?filename=tryphp_numbers_nan by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:29:30 GMT --></html>