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

(n \geq 1)

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

\frac{2 x^{2 n + 1}}{2 n + 1}

\frac{2 x^{2 n}}{2 n + 1}

\frac{2 x^{2 n}}{2 n - 1}

কোনটিই নয়

ANS : 5

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