PHP sinh( ) Function

The sinh() function is a builtin function in PHP and is used to find the hyperbolic sine of an angle.
The hyperbolic sine 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 sinh($value)

Parameters: This function accepts a single parameter $value. It is the number whose hyperbolic sine 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 sine value of number passed to it as argument.

Examples:

Input : sinh(3) 
Output : 10.01787492741

Input : sinh(-3)
Output : -10.01787492741

Input : sinh(M_PI)
Output : 11.548739357258

Input : sinh(0) 
Output : 0

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

• Passing 3 as a parameter:

  
  

  
  
  

  <?php    echo (sinh(3));    ?>

  Output:

  10.01787492741

• Passing -3 as a parameter:

  
  

  
  
  

  <?php    echo (sinh(-3));    ?>

  Output:

  -10.01787492741

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

  
  

  
  
  

  <?php    echo (sinh(M_PI));    ?>

  Output:

  11.548739357258

• Passing 0 as a parameter:

  
  

  
  
  

  <?php    echo (sinh(0));    ?>

  Output:

  0

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