यदि $\mathop {\lim }\limits_{x \to a} \frac{{{a^x} - {x^a}}}{{{x^x} - {a^a}}} = - 1$,तो

  • A
    $a = 1$
  • B
    $a = 0$
  • C
    $a = e$
  • D
    इनमें से कोई नहीं

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$\mathop {\lim }\limits_{x \to \pi /4} \frac{{\sqrt 2 \cos x - 1}}{{\cot x - 1}} = $

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