Evaluate `int_- 1^2|x^3-x|dx`

Explanation

To evaluate the integral \( I = \int_{-1}^{2} |x^3 - x| \, dx \), we will first analyze the expression inside the absolute value, \( x^3 - x \).

### Step 1: Find the points where \( x^3 - x = 0 \)

We start by solving the equation \( x^3 - x = 0 \):
\[ x(x^2 - 1) = 0 \]
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