### Home > PC > Chapter 6 > Lesson 6.2.3 > Problem 6-99

6-99.

Solve the equation 4 cos^{2} *x* = 3 for −∞ < *x* < ∞. Homework Help ✎

1. Solve for the cos *x*.

2. Use a unit circle to find solutions and their signs.

3. Add 2*πn* to each of the solutions above.