જો $f(x) = \sqrt{ax} + \frac{a^2}{\sqrt{ax}}$ હોય,તો $f'(a) = $

  • A
    $-1$
  • B
    $1$
  • C
    $0$
  • D
    $a$

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ધારો કે $f(x) = \mathop {\text{Lim}}\limits_{h \to 0} \frac{1}{h} \int\limits_x^{x + h} \frac{dt}{t + \sqrt{1 + t^2}}$,તો $\mathop {\text{Lim}}\limits_{x \to -\infty} x \cdot f(x)$ શું થાય?

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