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C Math cos() Function

❮ Math Functions


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.

❮ Math Functions


Related Pages

C Functions Tutorial

C Math Functions Tutorial


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