This document provides a mini-lesson on simplifying radicals and summarizing sum and difference formulas for trigonometric functions. It includes examples of finding the exact values of trigonometric functions like sin(75°), tan(105°), and cos(11π/12). There is an assignment listed at the end to complete problems #24, 4, 7, 11, 14, 25, 38, 56, 58, and 61 on page 404.

1. Simplifying Radicals Mini-
lesson

3. What about this?

5. 5.4 Sum and Difference
Formulas
Find the exact value:
sin 75°

6. Find the exact value:
sin 75°

7. Ex. 1) Find the exact value of the following
functions:
tan 105°
cos 11π/12

8. Ex. 2) Evaluate without a calculator.
cos 78°cos 18° + sin 78°sin 18°
Ex. 3) Verify

9. Ex. 4)

10. Assignment:
#24 p. 404
#4, 7, 11, 14, 25, 38, 56,
58, 61