Solve the Equation for X, Where X Is Restricted to the Given

Solve the equation for x, where x is restricted to the given interval.
- $y = 8 \cos 3 x$ , for $x$ in $\left[ 0 , \frac { \pi } { 3 } \right]$

A) $x = 8 \arccos \frac { y } { 3 }$
B) $x = \frac { 1 } { 8 } \arccos \frac { y } { 3 }$
C) $x = 3 \arccos \frac { y } { 8 }$
D) $x = \frac { 1 } { 3 } \arccos \frac { y } { 8 }$

Correct Answer:

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