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));
Try it Yourself »
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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