જો $f$ એક વાસ્તવિક વિધેય છે કે જેથી $f(4)=4$ અને $f^{\prime}(4)=16$ હોય,તો $\lim _{x \rightarrow 4} \frac{\sqrt{f(x)}-2}{\sqrt{x}-2} =$

  • A
    $16$
  • B
    $12$
  • C
    $8$
  • D
    $2$

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ધારો કે $\alpha$ અને $\beta$ એવી વાસ્તવિક સંખ્યાઓ છે કે જેથી $\lim _{x \rightarrow 0} \frac{1}{x^3}\left(\frac{\alpha}{2} \int_0^x \frac{1}{1-t^2} d t+\beta x \cos x\right)=2$ થાય. તો $\alpha+\beta$ ની કિંમત $....$ છે. ($.40$ માં)

$\lim _{x \rightarrow 1} \frac{a b^x-a^x b}{x^2-1} = $

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