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# 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:

 `      `

Output:

`10.01787492741`
• Passing -3 as a parameter:

 `      `

Output:

`-10.01787492741`
• When (M_PI) is passed as a parameter, M_PI is a constant in PHP whose value is 3.1415926535898:

 `      `

Output:

`11.548739357258`
• Passing 0 as a parameter:

 `      `

Output:

`0`

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