किसी भी पूर्णांक $n \geq 2$ के लिए,यदि $I_n = \int \cot^n x \, dx$ है,तो $I_5 =$

  • A
    $\frac{-\cot^4 x}{4} + \frac{\cot^2 x}{2} + \log |\sin x| + c$
  • B
    $\frac{-\cot^4 x}{4} + \frac{\cot^2 x}{2} - \log |\sin x| + c$
  • C
    $\frac{\cot^4 x}{4} + \frac{\cot^2 x}{2} + \log |\cos x| + c$
  • D
    $\frac{\cot^4 x}{4} - \frac{\cot^2 x}{2} - \cot x + c$

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