In Example 4 we considered a member of the family of functions that f(x) = sin(x + sin cx) occur in FM synthesis. Here we investigate the function with c = 3. Start by graphing f in the viewing rectangle [0, π] by [–1.2, 1.2], how many local maximum points do you see? The graph has more than are visible to the naked eye. To discover the hidden maximum and minimum points you will need to examine the graph of f’ very carefully. In fact, it helps to look at the graph of f’’ at the same time. Find all the maximum and minimum values and inflection points. Then graph f in the viewing rectangle [–2π, 2π] by [–1.2, 1.2] and comment on symmetry.