C Math cos() Function
Example
Return the cosine of different angles:
const double PI = 3.141592653589793;
printf("%f", cos(3));
printf("%f", cos(-3));
printf("%f", cos(0));
printf("%f", cos(PI));
printf("%f", cos(PI / 2.0));
Definition and Usage
The cos() function returns the cosine of an angle.
The cos() function is defined in the <math.h> 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 <math.h> library include a constant
M_PI but it is not guaranteed to be available.
Syntax
One of the following:
cos(double angle);Parameter Values
| Parameter | Description |
|---|---|
| angle | Required. An angle in radians to find the cosine of. |
Technical Details
| Returns: | A double value representing the cosine of an angle.
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