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Question

কোন ব্যবধিতে $f (x) = \frac{x}{x^{2} + 1}$ ক্রমবর্ধমান?

$(- \infty, 0)$

$(- 1, 1)$

$(0, \infty)$

$(- 1, \infty)$

ANS : 2

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