\[ \begin{array}{l} \text { If } \int \frac{d x}{\left(x^{2}+x+1\ri...

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\[
\begin{array}{l}
\text { If } \int \frac{d x}{\left(x^{2}+x+1\right)^{2}} \\
=a \cdot \tan ^{-1}\left(\frac{2 x+1}{\sqrt{3}}\right)+b \cdot\left(\frac{2 x+1}{x^{2}+x+1}\right)+c, x0
\end{array}
\]
\( \mathrm{P}^{11:} \)
W
then the value of \( (\sqrt{3} a+b) \) is equal to:
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