acosh

Definition and usage

acosh() function returns an inverse hyperbolic cosine of a number.

Example

Returns the inverse hyperbolic cosine value of different values:

 <?php
echo ( acosh ( 7 ) . "<br>" ) ;
echo ( acosh ( 56 ) . "<br>" ) ;
echo ( acosh ( 2.45 ) ) ;
?>

Try it yourself

grammar

 acosh ( x )

illustrate

Returns the inverse hyperbolic cosine value of x , that is, the value whose hyperbolic cosine is x .