# PHP cosh() Function

PHPServer Side ProgrammingProgramming

## Definition and Usage

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

cosh(x) = (ex – e-x))/2

This function returns a float value .

cosh ( float $arg ) : float ## Parameters Sr.NoParameter & Description 1arg A floating point value that represents angle in radians ## Return Values PHP cosh() function returns hyperbolic cosine ratio of given parameter. ## PHP Version This function is available in PHP versions 4.x, PHP 5.x as well as PHP 7.x. ## Example Live Demo Following example calculates cosh(pi/2) and returns 2.5091784786581 which is also the result of formula (ex + e-x))/2 − <?php$arg=M_PI_2;
$val=(exp($arg)+exp(-$arg))/2;$res=cosh($arg); echo "cosh(M_PI_2) = " .$val. "\n";
echo "using formula = " . $res . "\n"; ?> ## Output This will produce following result − cosh(M_PI_2) = 2.5091784786581 using formula = 2.5091784786581 ## Example Live Demo Following example uses deg2rad() function to convert degrees to radians and then uses cosh(60). Result is 1.6002868577024 − <?php$arg=deg2rad(60);
$val=cosh($arg);
echo "cosh(" . $arg . ") = " .$val;
?>

## Output

This will produce following result −

cosh(1.0471975511966) = 1.6002868577024

## Example

Live Demo

Let's check find out cosh(0). It returns 1 −

<?php
$arg=0;$val=cosh($arg); echo "cosh(" .$arg . ") = " . $val; ?> ## Output This will produce following result − cosh(0) = 1 ## Example Live Demo Following example computes cosh(pi) <?php$arg=M_PI;
$val=cosh($arg);
echo "cosh(" . $arg . ") = " .$val;
?>

## Output

This will produce following result −

cosh(3.1415926535898) = 11.591953275522