Use De Moivre's theorem to solve the following equations. (i) x^5-1=0 (ii) x ^ 7+ 1 = 0 (iii) x ^4 + x^3 + x^2 + x + 1 = 0 (20) x gi + x x+1=0 +. (v) x-x + x-1=0 (vi) x + gi + 1 =0.