The asinh() function returns the inverse hyperbolic sine of a number.
Syntax
asinh(num)
Parameters
num − The number to be specified.
Return
The asinh() function returns the inverse hyperbolic sine of a number.
Example
<?php echo(asinh(1) . "<br>"); echo(asinh(1.75) . "<br>"); ?>
Output
0.88137358701954<br>1.3258977669011<br>