Find the Exact Solution to the Equation Without a Calculator $$\cos ^ { - 1 } ( \cos x ) = \frac { 1 } { 4 }$$

Multiple Choice

Find the exact solution to the equation without a calculator.
- $$\cos ^ { - 1 } ( \cos x ) = \frac { 1 } { 4 }$$

A) $\frac { 1 } { 4 }$
B) $\frac { 1 } { 8 }$
C) 4
D) 0