$\cot 7\frac{1}{2}^{\circ} + \tan 67\frac{1}{2}^{\circ} - \cot 67\frac{1}{2}^{\circ} - \tan 7\frac{1}{2}^{\circ}$ का मान है:

  • A
    एक परिमेय संख्या
  • B
    एक अपरिमेय संख्या
  • C
    $2(3 + 2\sqrt{3})$
  • D
    $2(3 - \sqrt{3})$

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