$\mathop {\lim }\limits_{x \to a} \frac{{({x^{ - 1}} - {a^{ - 1}})}}{{x - a}} = $

  • A
    $1/a$
  • B
    $-1/a$
  • C
    $1/a^2$
  • D
    $-1/a^2$

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