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<!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>
-0.98999249660045
-0.98999249660045
1
-1
1
