4.
$$\mathrm { f } ( x ) = 5 \sin 3 x ^ { \circ } , \quad 0 \leq x \leq 180$$
- Sketch the graph of \(\mathrm { f } ( x )\), indicating the value of \(x\) at each point where the graph intersects the \(x\) axis.
- Write down the coordinates of all the maximum and minimum points of \(\mathrm { f } ( x )\).
- Calculate the values of \(x\) for which \(\mathrm { f } ( x ) = 2.5\)
[0pt]
[P1 June 2002 Question 5]