A musician usually plays more than one note at a time; these are called harmonies. If you play three or more notes at once, you get a chord. An example of a chord is A–C#–E. Each of these notes has a different frequency. The frequency of A is 440 Hz, the frequency of C# is 554.37 Hz, and the frequency of E is 659.25 Hz.

Create a function for each note, and then add them to create a combination function for the chord A–C#–E. Write all four of these functions in your response. Graph the combination function, keeping the scale of the graph similar to the scale you used in part b. Paste a copy of the graph below.