sin/cos line

#include <bits/stdc++.h>

using namespace std;

#define int long long
#define ld long double
#define inf 9e18
#define v vector
#define min(a, b) (a < b ? a : b)
#define max(a, b) (a > b ? a : b)


struct Point {
    int x, y;
};

struct Vector {
    Point b, e;
};

ld distance(Point a, Point b) {
    return sqrt((a.x - b.x) * (a.x - b.x) + (a.y - b.y) * (a.y - b.y));
}

int sq_distance(Point a, Point b) {
    return (a.x - b.x) * (a.x - b.x) + (a.y - b.y) * (a.y - b.y);
}

int cross_product(Vector a, Vector b) {
    return (a.e.x - a.b.x)*(b.e.y - b.b.y) - (b.e.x - b.b.x)*(a.e.y - a.b.y);
}

int scalar_vector_multiply(Vector a, Vector b) {
    return (a.e.x - a.b.x)*(b.e.x - b.b.x) + (b.e.y - b.b.y)*(a.e.y - a.b.y);
}

signed main(signed argc, char* argv[]) {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
//    cout.setf(ios::fixed);
//    cout.precision(6);
//    freopen("input.txt", "r", stdin);
//    freopen("output.txt", "w", stdout);

    Vector a;
    cin >> a.b.x >> a.b.y >> a.e.x >> a.e.y;
    Point c;
    cin >> c.x >> c.y;
    Vector b;
    b.b = a.b;
    b.e = c;

    ld len_a = distance(a.b, a.e);
    ld len_b = distance(b.b, b.e);



    int cp = cross_product(a, b);
    int svm = scalar_vector_multiply(a, b);
    if (cp == 0) {
        cout << "on line";
    } else if (cp > 0) {
        cout << "left line";
    } else {
        cout << "right line";
    }

    ld sin_a = cp / (len_a * len_b);
    ld cos_a = svm / (len_a * len_b);
    cout << "\nsin = " << sin_a;
    cout << "\ncos = " << cos_a;

    return 0;
}