We assume that we need to simplify the expression in two different ways.
Answer:
One way: Raise both, the numerator and denominator, to the third power, and then simplify the expression.
Second way: Simplify the terms inside parentheses, and then raise the result to the third power.
The result of both ways is the same:

Explanation:
One way
Raise both, the numerator and denominator, to the third power, and then simplify the expression:





This is the first simplification.
Second way
Simplify the terms inside parentheses, and then raise the result to the third power.






or
.