Integral of $$$\frac{\left(2 x + 1\right) \ln\left(x^{2} + 1\right)}{\left(x^{2} + x + 1\right)^{2} + 1}$$$
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Find $$$\int \frac{\left(2 x + 1\right) \ln\left(x^{2} + 1\right)}{\left(x^{2} + x + 1\right)^{2} + 1}\, dx$$$.