### Home > PC > Chapter 6 > Lesson 6.2.3 > Problem6-99

6-99.

Solve the equation $4 \cos^{2} x = 3$ for $−∞ \lt x \lt ∞$.

1. Solve for the $\cos x$.
2. Use a unit circle to find solutions and their signs.
3. Add $2πn$ to each of the solutions above.