PHP cosh( ) Function

The cosh() function is a builtin function in PHP and is used to find the hyperbolic sine of an angle.
The hyperbolic cosine of any argument arg is defined as,

(exp(arg) + exp(-arg))/2

Where, exp() is the exponential function and returns e raised to the power of argument passed to it. For example exp(2) = e^2.

Syntax:

float cosh($value)

Parameters:This function accepts a single parameter $value. It is the number whose hyperbolic cosine value you want to find. The value of this parameter must be in radians.

Return Value: It returns a floating point number which is the hyperbolic cosine value of number passed to it as argument.

Examples:

Input : cosh(3) 
Output : 10.067661995778

Input : cosh(-3)
Output : 10.067661995778

Input : cosh(2*M_PI)
Output : 267.74676148375

Input : cosh(0) 
Output : 1

Below programs taking different values of $value are used to illustrate the cosh() function in PHP:

• Passing 3 as a parameter:

  <?php
  
  echo (cosh(3));
  
  ?>

  Output:

  10.067661995778

• Passing -3 as a parameter:

  <?php
  
  echo (cosh(-3));
  
  ?>

  Output:

  10.067661995778

• When (2*M_PI) is passed as a parameter, M_PI is a constant in PHP whose value is 3.1415926535898:

  <?php
  
  echo (cosh(2*M_PI));
  
  ?>

  Output:

  267.74676148375

• Passing 0 as a parameter:

  <?php
  
  echo (cosh(0));
  
  ?>

  Output:

  1

Reference:
http://php.net/manual/en/function.cosh.php