### Home > PC3 > Chapter 4 > Lesson 4.1.3 > Problem 4-48

4-48.

Write an equation for each graph below.

This equation is most easily written as a cosine function:

1. Where is the midline?

2. What is the amplitude?

3. Identify the period and calculate "".

Substitute the information in the general equation for cosine.

This equation is most easily written as a negative sine function:

1. Where is the midline?

2. What is the amplitude?

3. Identify the period and calculate "".

Substitute the information in the general equation for sine.