W3School TIY Editor
W3School 在线教程
改变方向
暗黑模式
<!DOCTYPE html> <html> <body> <?php echo(atan(0.50) . "<br>"); echo(atan(-0.50) . "<br>"); echo(atan(5) . "<br>"); echo(atan(-5) . "<br>"); echo(atan(100) . "<br>"); echo(atan(-100)); ?> </body> </html>