01  #include <stdio.h>
02  #include <math.h>
03  
04  int main()
05  {
06    double result;
07    double x = 0.5;
08  
09    result = cos(x);
10    printf("The cosine of %lf is %lfn", x, result);
11    
12    return 0;
13  }

 
 OUTPUT :
 
 The cosine() of 0.500000 is 0.877583