Use Substitution to Determine Whether the Given X-Value Is a Solution

Multiple Choice

Use substitution to determine whether the given x-value is a solution of the equation.
Find All Solutions of a Trigonometric Equation
- $2 \cos x - 1 = 0$

A) $x = \frac { \pi } { 3 } + 2 n \pi$ or $x = \frac { 5 \pi } { 3 } + 2 n \pi$
B) $x = \frac { \pi } { 3 } + n \pi$ or $x = \frac { 5 \pi } { 3 } + n \pi$
C) $x = \frac { 4 \pi } { 3 } + 2 n \pi$ or $x = \frac { 5 \pi } { 6 } + 2 n \pi$
D) $x = \frac { 4 \pi } { 3 } + n \pi$ or $x = \frac { 5 \pi } { 6 } + n \pi$