$\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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જો વિધેય $f$ એ $f(x) = \frac{\cot^3 x - \tan x}{\cos(x + \pi/4)}$ દ્વારા $x \neq \pi/4$ માટે વ્યાખ્યાયિત હોય,તો $\lim_{x \rightarrow \pi/4} f(x) = $

$\mathop {\lim }\limits_{n \to \infty } \frac{{\sqrt n }}{{\sqrt n + \sqrt {n + 1} }} = $

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