(a) Let f(x) = 4.x³ – 7x +3. Show that (x – 1) is a factor of f(x) and, using polynomial division, find the solutions of the equation 4x³ –

7x + 3 = 0. (b) Hence,otherwise, solve the equation or 2 cos(20) sin 0+ 5 sin 0 – 3 = 0, for 0 < 0 < 180°. You must show all steps of your method.