જો $\frac{(\cot A \cot B - 1)}{(\cot B + \cot A)} = x$ હોય,તો $x$ ની કિંમત શું થાય?

  • A
    $\cot (A - B)$
  • B
    $\tan (A + B)$
  • C
    $\cot (A + B)$
  • D
    $\tan (A - B)$

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