If $\tan \frac{B - C}{2} = x \cot \frac{A}{2},$ then $x = $

  • A
    $\frac{c - a}{c + a}$
  • B
    $\frac{a - b}{a + b}$
  • C
    $\frac{b - c}{b + c}$
  • D
    None of these

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