Format
#include <math.h>
double cos(double x);Language Level: ANSI
Threadsafe: Yes.
Description
The cos() function calculates the cosine of x. The value x is expressed in radians. If x is too large, a partial loss of significance in the result might occur.
Return Value
The cos() function returns the cosine of x. The value of errno can be set to either EDOM or ERANGE.
Example that uses cos()
This example calculates y to be the cosine of x.
#include <math.h>
#include <stdio.h>
int main(void)
{
double x, y;
x = 7.2;
y = cos(x);
printf("cos( %lf ) = %lf\n", x, y);
}
/********************* Output should be similar to: *******************
cos( 7.200000 ) = 0.608351
*/Related Information