求cosx的近似值

台劳多项式求cosx

#include “pch.h”
#include < iostream>
#include<math.h>
void main()
{
double sum = 0, x;
scanf_s("%lf", &x);
for (int i = 2,a=1; i < 13; i += 2, a = 1) {
for (int j = i; j > 1; j–) {
a *= j;
}
if ((i/2) % 2 ==0){
sum += pow(x, i) / a; }
else{ sum -= pow(x, i) / a; }
}
printf(“cosx=%lf\n”, sum + 1);
}