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
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