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$\int \frac{d x}{x^{2} - x + 1}$ এর মান নির্ণয় কর।

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

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

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

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

\frac{2}{\sqrt{3}} \sin^{- 1} (\frac{2 x - 1}{\sqrt{3}}) + c

ANS : 4

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