Let w be a complex number, z a 4th root of w.
1) Show that z(k) = p^1/4[cos((θ + 2kπ)/4) + isin((θ + 12kπ)/4)], k = 0, 1, 2, 3, is a formula for the 4th roots of w, where θ is the argument of w and p its modulus.
2) hence , determine 4th roots of 16.
please assist.