$\int \frac{dx}{(1+x) \sqrt{8+7x-x^2}} = $

  • A
    $-\frac{2}{9} \sqrt{\frac{8-x}{1+x}} + c$
  • B
    $-\frac{1}{9} \sqrt{\frac{1+x}{8-x}} + c$
  • C
    $-\frac{2}{9} \sqrt{\frac{1+x}{8-x}} + c$
  • D
    $\frac{2}{9} \sqrt{\frac{8+x}{1+x}} + c$

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$\frac{e^{-\pi/4} + \int_0^{\pi/4} e^{-x} \tan^{50} x \, dx}{\int_0^{\pi/4} e^{-x} (\tan^{49} x + \tan^{51} x) \, dx}$ का मान है

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