यदि $y = \sqrt {\frac{{1 + x}}{{1 - x}}} ,$ है,तो $\frac{{dy}}{{dx}} = $

  • A
    $\frac{2}{{{{(1 + x)}^{1/2}}{{(1 - x)}^{3/2}}}}$
  • B
    $\frac{1}{{{{(1 + x)}^{1/2}}{{(1 - x)}^{3/2}}}}$
  • C
    $\frac{1}{{2{{(1 + x)}^{1/2}}{{(1 - x)}^{3/2}}}}$
  • D
    $\frac{1}{{{{(1 + x)}^{3/2}}{{(1 - x)}^{1/2}}}}$

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यदि $y = [(x+1)(2x+1)(3x+1) \ldots (nx+1)]^2$ है,तो $x=0$ पर $\frac{dy}{dx}$ का मान ज्ञात कीजिए।

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