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JEE MAIN - Mathematics Hindi (2017 (Offline) - No. 18)

यदि $$x \in\left(0, \frac{1}{4}\right)$$ के लिए $$\tan ^{-1}\left(\frac{6 x \sqrt{x}}{1-9 x^{3}}\right)$$ का अवकलन $$\sqrt{x} \cdot \mathrm{g}(x)$$ है, तो $$\mathrm{g}(x)$$ बराबर है :
$$\frac{3 x \sqrt{x}}{1-9 x^{3}}$$
$$\frac{3 x}{1-9 x^{3}}$$
$$\frac{3}{1+9 x^{3}}$$
$$\frac{9}{1+9 x^{3}}$$

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