4.

f(x) = 5sin 3 * x deg

0 < x < 180

(a) Sketch the graph of f(x) indicating the value of x at each point where the graph intersects the x-axis. (3)

(3)

(b) Write down the coordinates of all the maximum and minimum points of f(x)

(c) Calculate the values of x for which f(x) = 2.5

(4)