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$\int \frac{d x}{x^{2} - x + 1} =$ কত?

\frac{x - 1}{x + 2}

\frac{2}{3} \cot (\frac{2 x + 3}{\sqrt{5}})

s i n^{2} 2 x

\frac{2}{\sqrt{3}} \tan^{- 1} (\frac{2 x - 3}{\sqrt{3}})

ANS : 4

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