The "acos" function is used for calcution of the arc cosine value of a given input.
double acos(double x);
The "acos" function accepts 1 parameters
#include <stdio.h> #include <math.h> #include<conio.h> int main() { double x,acos_value; clrscr(); printf("\nEnter the number : "); scanf("%lf",&x); acos_value = acos(x); printf("The arc cosine value is %lf\n", acos_value); getch(); return 0; }