# PHP tanh() Function

PHPServer Side ProgrammingProgramming

## Definition and Usage

The tanh() function returns the hyperbolic tangent ratio of given angle in radians. In trigonometry, hyperbolic tangent ratio is defined as.

tanh(x) = sinh()/tanh()

This function returns a float value .

tanh ( float $arg ) : float ## Parameters Sr.NoParameter & Description 1arg A floating point value that represents angle in radians ## Return Values PHP tanh() function returns hyperbolic tangent ratio of given parameter. ## PHP Version This function is available in PHP versions 4.x, PHP 5.x as well as PHP 7.x. ## Example Live Demo Following example calculates tanh(pi/2) and returns 2.5091784786581 which is also the result of formula (ex + e-x))/2 − <?php$arg=M_PI_2;
$res=tanh($arg);
echo "tanh(pi) = " . $res . "\n"; echo "using formula = " . sinh($arg)/cosh($arg); ?> ## Output This will produce following result − tanh(pi) = 0.91715233566727 using formula = 0.91715233566727 ## Example Live Demo Following example uses deg2rad() function to convert degrees to radians and then uses tanh(60). Result is 0.78071443535927 − <?php$arg=deg2rad(60);
$val=tanh($arg);
echo "tanh(" . $arg . ") = " .$val;
?>

## Output

This will produce following result −

tanh(1.0471975511966) = 0.78071443535927

## Example

Live Demo

Let's check find out tanh(0). It returns 0 −

<?php
$arg=0;$val=tanh($arg); echo "tanh(" .$arg . ") = " . $val; ?> ## Output This will produce following result − tanh(0) = 0 ## Example Live Demo Following example computes tanh(pi) which is approximately equal to 0 <?php$arg=M_PI;
$val=tanh($arg);
echo "tanh(" . $arg . ") = " .$val;
?>

## Output

This will produce following result −

tanh(3.1415926535898) = 0.99627207622075
Updated on 30-Jun-2020 07:34:05