જો $f(2) = 4$ અને $f'(2) = 1$ હોય,તો $\mathop {\lim }\limits_{x \to 2} \frac{xf(2) - 2f(x)}{x - 2} = $

  • A
    $1$
  • B
    $2$
  • C
    $3$
  • D
    $-2$

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જો $y=\frac{x \sin ^{-1} x}{\sqrt{1-x^2}}+\log \sqrt{1-x^2}$ હોય, તો $\frac{d y}{d x}=$

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