यदि $\int {\frac{{\cos 4x + 1}}{{\cot x - \tan x}}} dx = k\,\cos 4x + c$ है,तो:

  • A
    $k = - 1/2$
  • B
    $k = - 1/8$
  • C
    $k = - 1/4$
  • D
    इनमें से कोई नहीं

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