# Cosine Function Modeling (y = a cos(x) + d) Quiz

- Author:
- Tim Brzezinski

So far, you already know what the graph of the parent cosine function,

*y = cos(x)*, looks like. In this applet below, you are given a graph of the function**y = a cos(x) + d**. As you already know, the values "a" & "d" both affect the graph parent cosine function y = cos(x). Your task here: Given the graph of**y = a cos(x) + d**, determine the parameters "a" and "d".*Hint: The dashed horizontal line cuts the function in half. (*i]In fact, you can't.[/i]) As you determine the values of "a" and "d", enter them in the input boxes.**You should not need to zoom out at all. [***Click the "Generate New Wave" button as many times as you need until you've mastered this concept!***Once you're correct, you'll know it!****GOOD LUCK!!!**For additional practice in determining the values of the parameters "a" and "d" from viewing the graph of y = a sin(x), go to http://tube.geogebra.org/m/1537267