$\lim _{x \rightarrow 0} \frac{1-\cos x \cos 2 x}{\sin ^2 x} = $

  • A
    $\frac{11}{4}$
  • B
    $\frac{5}{2}$
  • C
    $3$
  • D
    $5$

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$\lim _{x \rightarrow \infty}\left[\sqrt{x^2+2 x-1}-x\right]$ का मान ज्ञात कीजिए :

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