$\mathop {\lim }\limits_{x \to a} \frac{{\cos x - \cos a}}{{\cot x - \cot a}} = $

  • A
    $\frac{1}{2}{\sin ^3}a$
  • B
    $\frac{1}{2}{\csc ^2}a$
  • C
    $\sin ^3 a$
  • D
    $\csc ^3 a$

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