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যোগজ নির্ণয় কর (Integrate):

\int \frac{d x}{x \sqrt{x^{2} + 1}}

s e c^{- 1} x + c

c o s e c^{- 1} x + c

- x^{2} \sqrt{x^{2} - 1 + c}

None of these

ANS : 4

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