Tutorial Exercise Sketch the graph of the function showing the amplitude and period of the function below. y = cos(3t) Step 1 The question asks us to sketch the function y = cos(3t). First, note that the function is a cosine function and will ha that basic shape. From the text, the general form of a (non-shifted) cosine function is y = a cos(bt). The text also tells us that a is the amplitude; that is, the maximum height above zero that the function attains. Note that the amplitude must be a phor Looking at our function, the amplitude is