$\Delta ABC$ માં,જો ${b^2} + {c^2} = 3{a^2}$ હોય,તો $\cot B + \cot C - \cot A = $

  • A
    $1$
  • B
    $\frac{ab}{4\Delta}$
  • C
    $0$
  • D
    $\frac{ac}{4\Delta}$

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