Evaluate : `int_(-1)^2|x^3-x|\ dx`

Explanation

To evaluate the integral \( \int_{-1}^{2} |x^3 - x| \, dx \), we need to consider the absolute value function, which requires us to determine where the expression inside the absolute value changes sign.

### Step-by-step Solution:

1. **Identify the points where \( x^3 - x = 0 \)**:
\[ x^3 - x = 0 \implies x(x^2 - 1) = 0 \implies x(x - 1)(x + 1) = 0 \]
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