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<!DOCTYPE html> <html> <body> <?php echo(sin(3) . "<br>"); echo(sin(-3) . "<br>"); echo(sin(0) . "<br>"); echo(sin(M_PI) . "<br>"); echo(sin(M_PI_2)); ?> </body> </html>
0.14112000805987
-0.14112000805987
0
1.2246467991474E-16
1