જો $\int \frac{\cos 4x + 1}{\cot x - \tan x} dx = k \cos 4x + c$ હોય,તો $k$ ની કિંમત શોધો.

  • A
    $-\frac{1}{2}$
  • B
    $-\frac{1}{4}$
  • C
    $-\frac{1}{8}$
  • D
    $-1$

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