#include "iostream"
#include "climits"
#include "list"
#include "queue"
#include "stack"
#include "set"
#include "functional"
#include "algorithm"
#include "string"
#include "map"
#include "unordered_map"
#include "unordered_set"
#include "iomanip"
#include "cmath"
#include "random"
#include "bitset"
#include "cstdio"
#include "numeric"
#include "cassert"
#include "functional"
#include "ctime"

using namespace std;

constexpr long long int MOD = 1000000007;
//constexpr int MOD = 1000000007;
//constexpr int MOD = 998244353;
//constexpr long long int MOD = 998244353;
constexpr double EPS = 1e-8;

//int N, M, K, H, W, L, R;
long long int N, M, K, H, W, L, R;


int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);

	cin >> N >> K;
	vector<long double >v(N);
	for (auto &i : v) {
		cin >> i;
		i /= K;
		i *= 3.1415926535;
		i *= 2;
	}
	long double x = 0, y = 0;
	for (int i = 0; i < N; i++) {
		for (int j = 1; j < N; j++) {
			x += cos((v[i] + v[(i + j) % N]) / 2 + ((i + j) / N)*3.1415926535)*(N - j - 1);
			y += sin((v[i] + v[(i + j) % N]) / 2 + ((i + j) / N)*3.1415926535)*(N - j - 1);
		}
	}
	cout << setprecision(20) << x *6/( N*(N - 1)*(N - 2) ) << " " << y *6/( N*(N - 1)*(N-2) ) << endl;
}