Solve the Equation for Exact Solutions $$\cos ^ { - 1 } x = \sin ^ { - 1 } \frac { 4 } { 5 }$$

Solve the equation for exact solutions.
- $$\cos ^ { - 1 } x = \sin ^ { - 1 } \frac { 4 } { 5 }$$

A) $\left\{ \frac { 3 } { 4 } \right\}$

B) $\left\{ \frac { 3 } { 5 } \right\}$
C) $\{ 0 \}$
D) $\varnothing$