જો $y = \log \left[ \frac{x + \sqrt{x^2 + 25}}{\sqrt{x^2 + 25} - x} \right]$ હોય,તો $\frac{dy}{dx} = \dots$

  • A
    $\frac{1}{\sqrt{x^2 + 25}}$
  • B
    $\frac{2}{\sqrt{x^2 + 25}}$
  • C
    $\frac{-1}{\sqrt{x^2 + 25}}$
  • D
    $\frac{-2}{\sqrt{x^2 + 25}}$

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જો બે વક્રો $y=a^x$ અને $y=b^x$ એ $\alpha$ ખૂણે છેદતા હોય,તો $\tan \alpha=$

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