Evaluate: `int(x^2-1)/(x^4+x^2+1)\ dx`

Explanation

To evaluate the integral \(\int \frac{x^2 - 1}{x^4 + x^2 + 1} \, dx\), we can follow these steps:

### Step 1: Simplify the integrand
We start with the integral:
\[ \int \frac{x^2 - 1}{x^4 + x^2 + 1} \, dx \]
Notice that we can factor out \(x^2\) from the denominator:
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