a. Show that 5 sin 2 + 4 sin = 0 can be written in the

a. Show that 5 sin 2θ + 4 sin θ = 0 can be written in the form a sin θ (b cos θ + c) = 0, stating the values of a, b and c.

b. Hence solve, for 0 ≤ θ , 360°, the equation 5 sin 2θ + 4 sin θ = 0.