$\mathop {\lim }\limits_{x \to 0} \left[ {\frac{{\sin (x + a) + \sin (a - x) - 2\sin a}}{{x\sin x}}} \right] = $

  • A
    $\sin a$
  • B
    $\cos a$
  • C
    $-\sin a$
  • D
    $\frac{1}{2}\cos a$

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