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"); 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