यदि $\int \frac{d x}{\cot ^2 x-1}=\frac{1}{A} \log |\sec 2 x+\tan 2 x|-\frac{x}{B}+c$,(जहाँ $c$ समाकलन का स्थिरांक है),तो $A+B=$

  • A
    $-6$
  • B
    $6$
  • C
    $-5$
  • D
    $5$

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