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<!DOCTYPE html> <html> <body> <?php echo(atanh(M_PI_4) . "<br>"); echo(atanh(0.50) . "<br>"); echo(atanh(-0.50) . "<br>"); echo(atanh(1) . "<br>"); echo(atanh(-1)); ?> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/edibu.js"></script> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/tongji.js"></script></body> </html>
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INF
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