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<?php
echo(tan(M_PI_4));
echo(tan(0.50));
echo(tan(-0.50));
echo(tan(5));
echo(tan(10));
echo(tan(-5));
echo(tan(-10));
?>

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1
0.546302489844
-0.546302489844
-3.38051500625
0.648360827459
3.38051500625
-0.648360827459
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