### Home > CALC > Chapter 6 > Lesson 6.3.4 > Problem6-117

6-117.
1. Multiple Choice: Which of the following expressions is equal to ? Homework Help ✎

 I. 2 cos x II. −2 cos x sin x III. −sin 2x
1. I only

2. II only

3. III only

4. II and III

5. none

There may be more than one correct answer.