यदि एक फलन $f$ को $f(x) = \frac{\cot^3 x - \tan x}{\cos(x + \pi/4)}$ द्वारा $x \neq \pi/4$ के लिए परिभाषित किया गया है,तो $\lim_{x \rightarrow \pi/4} f(x) = $

  • A
    $4$
  • B
    $8$
  • C
    $8/3$
  • D
    $16$

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