Question

write a program in C++ to find the sum of cos series(two inputs are x and n and x is not in degrees)​

Answer 1

Answer:

// CPP program to find the

// sum of cos(x) series

#include <bits/stdc++.h>

using namespace std;

const double PI = 3.142;

double cosXSertiesSum(double x,

int n)

{

x = x * (PI / 180.0);

double res = 1;

double sign = 1, fact = 1,

pow = 1;

for (int i = 1; i < 5; i++)

{

sign = sign * -1;

fact = fact * (2 * i - 1) *

(2 * i);

pow = pow * x * x;

res = res + sign *

pow / fact;

}

return res;

}

// Driver Code

int main()

{

float x = 50;

int n = 5;

cout << cosXSertiesSum(x, 5);

return 0;

}

Answer 2

// CPP program to find the

// sum of cos(x) series

#include <bits/stdc++.h>

using namespace std;

const double PI = 3.142;

double cosXSertiesSum(double x,

int n)

{

x = x * (PI / 180.0);

double res = 1;

double sign = 1, fact = 1,

pow = 1;

for (int i = 1; i < 5; i++)

{

sign = sign * -1;

fact = fact * (2 * i - 1) *

(2 * i);

pow = pow * x * x;

res = res + sign *

pow / fact;

}

return res;

}

// Driver Code

int main()

{

float x = 50;

int n = 5;

cout << cosXSertiesSum(x, 5);

return 0;