The ** sin() function** in C returns the

`sine`

of a number. To be more specific, it returns the `sine`

of a number in the `radians float value`

.The illustration below shows the mathematical representation of the `sin()`

function.

Note:

- The
`math.h`

header file is required for this function.- This
`sin()`

function only works for right-angled triangles.

```
double sin(double num)
```

This function requires a `number`

that represents an `angle`

in `radians`

as a parameter.

In order to convert `degrees`

to `radians`

, use the following formula:

```
radians = degrees * ( PI / 180.0 )
```

`sin()`

returns the `sine`

of a number `(radians float value)`

that is sent as a parameter.

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

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