C Tutorial/math.h/cos
cos
Item Value Header file math.h Declaration float cosf(float arg);double cos(double arg);long double cosl(long double arg); Function returns the cosine of arg. Parameter arg must be in radians.
#include <math.h>
#include <stdio.h>
int main(void)
{
double val = -1.0;
do {
printf("Cosine of %f is %f.\n", val, cos(val));
val += 0.1;
} while(val<=1.0);
return 0;
}