根据泰勒级数 cosx = 10! - x^22! + x^44! - x^66! + 编写函数double myCosdouble求cosx的近似值。

#include <iostream>
#include <cmath>
using namespace std;

double myCos(double x) {
    double ans = 1, term = 1;
    for (int i = 1; i <= 10; i++) { // 取前10项进行近似
        term *= -x * x / (2 * i - 1) / (2 * i);
        ans += term;
    }
    return ans;
}

int main() {
    double x;
    cout << "请输入x的值：";
    cin >> x;
    cout << "cos(" << x << ") 的近似值为：" << myCos(x) << endl;
    cout << "cos(" << x << ") 的真实值为：" << cos(x) << endl; // 对比真实值
    return 0;
}