यदि $f(x) = \frac{x(a^x - 1)}{1 - \cos x}$ और $g(x) = \frac{x(1 - a^x)}{a^x(\sqrt{1 - x^2} - \sqrt{1 + x^2})}$ है,तो $\lim_{x \to 0} (f(x) - g(x)) = $

  • A
    $3 \log a$
  • B
    $e^a$
  • C
    $2 \log a$
  • D
    $\log a$

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

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