### 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.

Use the eTool below to find the needed reference angles.

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