यदि $\alpha=\lim _{x \rightarrow 0} \frac{x \cdot 2^x-x}{1-\cos x}$ और $\beta=\lim _{x \rightarrow 0} \frac{x \cdot 2^x-x}{\sqrt{1+x^2}-\sqrt{1-x^2}}$ है,तो

  • A
    $\alpha=\beta$
  • B
    $2\alpha=\beta$
  • C
    $\alpha=2 \beta$
  • D
    $\alpha=3\beta$

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