C Reference function cos()
Usage of cos():
double cos(double x);
Parameters:
The value of x has no range.
Return value:
The returned value is in the range of -1 to +1 (inclusive).
Source code example of cos():
#include<stdio.h>
#include<math.h>
#define PI 3.14159265
main()
{
double input, output;
input = 60.0;
output = cos (input*PI/180);
printf ("Cosine of %lf degrees is %lf.\n", input, output );
return 0;
}
Output of the cos example program above:
Cosine of 60.000000 degrees is 0.500000
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