6.
$$f ( x ) = \cos 2 x , \quad 0 \leq x \leq \pi .$$
- Sketch the curve \(y = \mathrm { f } ( x )\).
- Write down the coordinates of any points where the curve \(y = \mathrm { f } ( x )\) meets the coordinate axes.
- Solve the equation \(\mathrm { f } ( x ) = 0.5\), giving your answers in terms of \(\pi\).