tryphp_func_math_atan.php:
"); echo(atan(-0.50) . "
"); echo(atan(5) . "
"); echo(atan(-5) . "
"); echo(atan(100) . "
"); echo(atan(-100)); ?>
0.46364760900081
-0.46364760900081
1.373400766945
-1.373400766945
1.5607966601082
-1.5607966601082