$\mathop {\lim }\limits_{x \to \pi /4} \frac{{{{\cot }^3}x - \tan x}}{{\cos \left( {x + \pi /4} \right)}}$ का मान है

  • A
    $4$
  • B
    $4\sqrt{2}$
  • C
    $8\sqrt{2}$
  • D
    $8$

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