(i)[3]
State the lowest and highest values of $y$ for both the curve and the line for $0 \leq x \leq 2\pi$.
(ii)[3]
Sketch the graphs of $y = 3\cos 2x$ and $2y + \frac{3x}{\pi} = 5$ on the same diagram for $0 \leq x \leq 2\pi$.
(iii)[1]
State the number of solutions of the equation $6\cos 2x = 5 - \frac{3x}{\pi}$ for $0 \leq x \leq 2\pi$.