## Reflection: Developing a Conceptual Understanding The Parent Functions are Related to Sine and Cosine - Section 3: Extend

Something that I can easily take for granted is the knowledge that the coefficient of 2 in y = cos(2(x - 60°)) is a horizontal change instead of a vertical change. I try to stress to students that the values inside the parentheses that are grouped with the x-variable will affect the graph horizontally and those values that are outside of the parentheses will affect the vertical aspects of the graph.

It is definitely a good idea to review these concepts if you feel they are necessary for your class.

How to Categorize Transformations
Developing a Conceptual Understanding: How to Categorize Transformations

# The Parent Functions are Related to Sine and Cosine

Unit 4: Trigonometric Functions
Lesson 3 of 14

## Big Idea: Use properties of sine and cosine to graph all of six trigonometric parent functions.

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50 minutes

### Tim Marley

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