Sin function returns sine of an angle(in radian).
Declaration: double sin(double);
C program
#include <stdio.h>
#include <math.h>
#include <math.h>
int main()
{
double result, x = M_PI/6;
result = sin(x);
printf("The sin(%lf) = %.2lf\n", x, result);
return 0;
}