### Home > INT3 > Chapter 9 > Lesson 9.2.2 > Problem 9-109

9-109.

Susan knows how to shift

*to get the graph at right, but she wonders if it is possible to get the same graph by shifting*

*.*

Is it possible to write a cosine function for this graph?

Yes, it is.

If you think writing a cosine function is possible, write an equation that has cosine. If you think writing one is impossible, explain why.

The graph of

starts at a maximum. This graph has a maximum atAdlai says,

*“I can get that graph*without*shifting to the right or left.”*What equation does he write?