If α0,α1,α2,…,αn−1 are nth roots of unity, then αk=cos(2kπn)+i sin(2kπn); where 0≤k≤n−1, Also (xn−1)=(x−α0)(x−α1)…(x−αn−1) Value of (1+α0)(1+α1)…(1+αn−1) is