$\Delta ABC$ में,यदि $2s = a + b + c$ है,तो $\frac{s(s - a)}{bc} - \frac{(s - b)(s - c)}{bc}$ का मान =

  • A
    $\sin A$
  • B
    $\cos A$
  • C
    $\tan A$
  • D
    इनमें से कोई नहीं

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