यदि $\int \frac{\cos 8 x+1}{\cot 2 x-\tan 2 x} \,d x=A \cos 8 x+c$ है, जहाँ $c$ एक स्वेच्छ अचर है, तो $A$ का मान ज्ञात कीजिए।

  • A
    $\frac{1}{16}$
  • B
    $\frac{1}{8}$
  • C
    $\frac{-1}{8}$
  • D
    $\frac{-1}{16}$

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