### Home > INT3 > Chapter 9 > Lesson 9.1.6 > Problem 9-76

9-76.

What reference angle can you use to calculate the sine and cosine of each of the following angles? Refer to the Math Notes box in this lesson. *9-76 HW eTool* (Desmos) Homework Help ✎

Use the eTool below to find the needed reference angles.

Click the link to the right for full version: *INT3 9-76 HW eTool*.