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Tim_Cos.cpp
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// Tim_Cos.cpp #include <iostream> #include <math.h> using namespace std; double gt(int n) { double kq = 1; if (n == 0) return kq; for (int i = 1; i <= n; i++) { kq = kq * i; } return kq; } int main() { float x, e = 0.00001; double tong = 0, s1 = 0, s2 = 0; int i = 0; cout<<"Nhap x: "; cin>>x; cout<<"Tim duoc cos("<<x<<") = "; x = x * M_PI / 180; //Chuyen goc sang radian do { s1 = s2; tong += (pow(-1, i) * pow(x, 2 * i)) / gt(2 * i); s2 = tong; i++; } while (fabs(s2 - s1) > e); cout<<s2; return 0; }