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valarray cos() function in C++

Last Updated : 08 Mar, 2023
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The cos() function is defined in valarray header file. This function is used to calculate cosine of the value of each element in valarray and returns a valarray containing the cosine of all the elements. Syntax:

cos(varr);

Time Complexity: O(1)

Auxiliary Space: O(1)

Parameter: This function takes a mandatory parameter varr which represents valarray. Returns: This function returns a valarray containing the cosine of all the elements. Below programs illustrate the above function: Example 1:- 

CPP 
// C++ program to demonstrate
// example of cos() function.

#include <bits/stdc++.h>
using namespace std;
int main()
{
    // Initializing valarray
    valarray<double>
        varr = { 0, 0.25, 0.5, 0.75, 1 };

    // Declaring new valarray
    valarray<double> varr1;

    // use of cos() function
    varr1 = cos(varr);
    // Displaying new elements value
    cout << "The new valarray with"
        << " manipulated values is : "
        << endl;

    for (double& x : varr1) {
        cout << x << " ";
    }

    cout << endl;

    return 0;
}
Output:
The new valarray with manipulated values is : 
1 0.968912 0.877583 0.731689 0.540302

Example 2:- 

CPP 
// C++ program to demonstrate
// example of cos() function.

#include <bits/stdc++.h>
using namespace std;

int main()
{
    // Initializing valarray
    valarray<double>
        varr = { 1.2, 3.14, 5.0, 0.0 };

    // Declaring new valarray
    valarray<double> varr1;

    // use of cos() function
    varr1 = cos(varr);

    // Displaying new elements value
    cout << "The new valarray with"
        << " manipulated values is : "
        << endl;

    for (double& x : varr1) {
        cout << x << " ";
    }

    cout << endl;

    return 0;
}
Output:
The new valarray with manipulated values is : 
0.362358 -0.999999 0.283662 1

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