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<!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>
0.46364760900081
-0.46364760900081
1.373400766945
-1.373400766945
1.5607966601082
-1.5607966601082