**??? - 2013 JUNE Q4**

4.

(i) Starting with an equilateral triangle, prove that cos 30° =

(ii) Solve the equation 2 sin θ = -1 for 0≤ θ≤ 2π, giving your answers in terms of π. [3]

(i) Starting with an equilateral triangle, prove that cos 30° =

**√**3/2. [2](ii) Solve the equation 2 sin θ = -1 for 0≤ θ≤ 2π, giving your answers in terms of π. [3]