double cos ( double x );
float cos ( float x );
long double cos ( long double x ); |
<cmath> |
Compute cosine
Returns the cosine of an angle of x radians.
Parameters
- x
- Floating point value representing an angle expressed in radians.
Return Value
Cosine of
x.
Portability
In C, only the
double version of this function exists with this name.
Example
/* cos example */
#include <stdio.h>
#include <math.h>
#define PI 3.14159265
int main ()
{
double param, result;
param = 60.0;
result = cos (param*PI/180);
printf ("The cosine of %lf degrees is %lf.\n", param, result );
return 0;
}
|
Output:
The cosine of 60.000000 degrees is 0.500000.
|
See also
| sin | Compute sine (function) |
| tan | Compute tangent (function) |
