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<!DOCTYPE html> <html> <body> <?php echo(atan2(0.50,0.50) . "<br>"); echo(atan2(-0.50,-0.50) . "<br>"); echo(atan2(5,5) . "<br>"); echo(atan2(10,20) . "<br>"); echo(atan2(-5,-5) . "<br>"); echo(atan2(-10,10)); ?> </body> </html>