代码编辑器:
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echo atanh(M_PI_4) , "<br>";
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echo atanh(0.50) . "<br>";
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echo atanh(-0.50) , "<br>";
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echo atanh(1) . "<br>";
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echo atanh(-1);
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echo atanh(M_PI_4) , "<br>";
echo atanh(0.50) . "<br>";
echo atanh(-0.50) , "<br>";
echo atanh(1) . "<br>";
echo atanh(-1);