C++ cmath cos() function
Example
Return the cosine of different angles:
const double PI = 3.141592653589793;
cout << cos(3);
cout << cos(-3);
cout << cos(0);
cout << cos(PI);
cout << cos(PI / 2.0);
Definition and Usage
The cos() function returns the cosine of an angle.
The cos() function is defined in the <cmath> header file.
Note: Angles are measured in radians.
Tip: It is convenient to create a constant for PI so that you can use fractions of PI for angles. Some implementations of the <cmath> library include a constant M_PI but it is not guaranteed to be available.
Syntax
One of the following:
cos(double angle);cos(float angle);Parameter Values
| Parameter | Description |
|---|---|
| angle |
Required. An angle in radians to find the cosine of. If this is an integer type then it will be treated as a double.
|
Technical Details
| Returns: | A float value (if the argument is float) or double value (in any other case) representing the cosine of an angle. |
|---|
