asinh():inverse hyperbolic sine
asinh(float X);
X is the input value
<?Php
echo asinh(5); // Output 2.3124383412728
echo "<br>";
echo asinh(1.5); // Output 1.1947632172871
echo "<br>";
echo asinh(0); // Output 0
echo "<br>";
echo asinh(2); // Output 1.4436354751788
echo "<br>";
echo asinh(-2); // Output -1.4436354751788
echo "<br>";
echo asinh(-3); // Output -1.8184464592321
echo "<br>";
echo asinh(-10); // Output -2.998222950298
echo "<br>";
echo asinh(-20.4); // Output -3.7092822713042
?>
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