atanh

Definition and usage

atanh() function returns an inverse hyperbolic tangent of an angle.

Example

Returns the inverse hyperbolic tangent value of different values:

 <?php
echo ( atanh ( M_PI_4 ) ) ;
echo ( atanh ( 0.50 ) ) ;
echo ( atanh ( - 0.50 ) ) ;
echo ( atanh ( 1 ) ) ;
echo ( atanh ( - 1 ) ) ;
?>

Try it yourself

grammar

 atanh ( x )

illustrate

atanh() function returns the inverse hyperbolic tangent value of x , that is, the value whose hyperbolic tangent is x .