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harris910

The ** cos()** function in D returns the cosine of a number. To be more specific,

`cos()`

returns the cosine of a number in radians.The mathematical representation of the `cos()`

function is shown below.

`std.math`

is required for this function.- The
`cos()`

function only works for right-angled triangles.

```
cos(number)
//number can be real, float, or double.
```

This function requires a number that represents an angle in radians as a parameter.

To convert degrees to radians, use the following formula:

```
radians = degrees * ( PI / 180 )
```

`cos()`

returns the cosine of the number (in radians) that is sent as a parameter.

The following code shows how to use the `cos()`

function in D.

import core.stdc.stdio; import std.stdio; //header required for function import std.math; int main() { //positive number in radians writeln("The value of cos(2.3) ", cos(2.3)); // negative number in radians writeln("The value of cos(-2.3) ", cos(-2.3)); //converting the degrees angle into radians and then applying cos() // degrees = 180.0 // PI = 3.14159265 // result first converts degrees to radians then apply cos double result=cos(180.0 * (PI / 180.0)); writeln("The value of cos(180.0 * (PI / 180.0)) ", result); return 0; }

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