Create Cosx.cpp

Cosx.cpp

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+#include <iostream>
+#include<math.h>
+using namespace std;
+
+#define PI 3.1415926 // name of 3.1415926 is PI // PI just name 
+
+int main()
+{
+    const double pi = 3.1415926; // Value of pi is 3.1415926 !! pi is double 
+    double cosx = 1;
+    int sign = 1;
+    int n = 15;
+    long long int fact = 1;
+    double xd; // degree
+    double x; // rad
+    cin >> xd;
+    x = xd * pi/180;
+    double powerx = 1;
+    for (size_t i = 1; i <=  2*n; i+=2)
+    {
+        fact *= i * (i+1);
+        powerx *= x * x;
+        sign *= -1;
+        cosx += sign * powerx/fact;
+    }
+    cout << "Cos x = " << cosx << endl;
+    cout << "Cos x c++ = " <<  cos(x);
+    return 0;
+}