The **`sinh()` function** returns the *hyperbolic sine* of a number. To be more specific, it returns the hyperbolic sine of a number in the *radians float value*. 

The figure below shows the mathematical representation of the `sinh()` function.

> The `math.h` header file is required for this function.

# Syntax
```c
double sinh(double num)
```
# Parameter
This function requires a `number` that represents an `angle` in `radians` as a parameter.

>Use the following formula to convert `degrees` to `radians`
```c
radians = degrees * ( PI / 180.0 )
```

# Return value
`sinh()` returns the #key# hyperbolic sine of a number: in radians float value #key# that is sent as a parameter.

# Example


#include<stdio.h>
//header file
#include<math.h>

int main() {
    //positive number in radians
    printf("The hyperbolic sine of %lf is %lf \n", 2.3, sinh(2.3));

    // negative number in radians
    printf("The hyperbolic sine of %lf is %lf \n", -2.3, sinh(-2.3));

    //converting the degrees angle into radians and then applying sinh()
    // degrees = 45.0
    // PI = 3.14159265
    // result first converts degrees to radians then apply sinh
    double result=sinh(45.0 * (3.14159265 / 180.0));
    printf("The hyperbolic sine of %lf is %lf \n", 45.0, result);


}

What is sinh() in C?

Returns the hyperbolic sine of a number in radians. Requires math.h. Converts degrees to radians.