### Home > PC > Chapter 11 > Lesson 11.1.4 > Problem 11-59

11-59.

Show that 4 cos (*x* + *x* − 2*x*. Homework Help ✎

Use the Angle Sum Identity.

Substitute the exact values for sine and cosine of *π*/3. Then simplify.

11-59.

Show that 4 cos (*x* + *x* − 2*x*. Homework Help ✎

Use the Angle Sum Identity.

Substitute the exact values for sine and cosine of *π*/3. Then simplify.