C++ Math cos() function

In this post today I am going to discuss C++ Math cos() functions.

The function is used to determine the cosine of an angle given in terms of a radian.

Syntax Of cos() function:

Consider a radian ‘x’. The syntax would be:

float cos(float x);
float cos(double x);
float cos(long double x); 
double cos(integral x);

Parameter:

x: Value specified in terms of a radian.

Return value:

It returns the cosine of an angle in the range of[-1,1].

Example-1:

Let’s look at a basic case where x is positive.

#include <iostream>  
#include<math.h>  
using namespace std;  
int main()  
{  
    double degree=60;  
    double d=60*3.14/180;  
    cout<<"Cosine of an angle is : "<<cos(d);  
    return 0;  
}

Output:

Cosine of an angle is : 0.50046

When the degree is equal to60, the cos() function calculates the cosine of an angle.

Example-2:

Let’s look at a basic case where x is negative.

#include <iostream>  
#include<math.h>  
using namespace std;  
int main()  
{  
  double degree= -90;  
  double radian=degree*3.14/180;  
  cout<<"Cosine of an angle is :"<<cos(radian);  
  return 0;  
}

Output: