W3School TIY Editor
W3School 在线教程
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暗黑模式
<!DOCTYPE html> <html> <body> <?php echo(cos(3) . "<br>"); echo(cos(-3) . "<br>"); echo(cos(0) . "<br>"); echo(cos(M_PI) . "<br>"); echo(cos(2*M_PI)); ?> </body> </html>