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<!DOCTYPE html> <html> <body> <?php echo(tanh(M_PI_4) . "<br>"); echo(tanh(0.50) . "<br>"); echo(tanh(-0.50) . "<br>"); echo(tanh(5) . "<br>"); echo(tanh(10) . "<br>"); echo(tanh(-5) . "<br>"); echo(tanh(-10)); ?> </body> </html>
0.65579420263267
0.46211715726001
-0.46211715726001
0.9999092042626
0.99999999587769
-0.9999092042626
-0.99999999587769