જો $\lim _{x \rightarrow 2} \frac{1+\sqrt{1+4 \log _2 x}}{2+\left(2 x+\sin ^2 x+2 \cos x\right)(2 x-4)}=m$ હોય,તો $m(m-1)=$

  • A
    $0$
  • B
    $\log _2 e$
  • C
    $1$
  • D
    $\frac{1+\sqrt{3}}{2}$

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$\mathop {\lim }\limits_{x \to 0} \frac{{\tan x - \sin x}}{{{x^3}}} = $

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