यदि $I_n = \int \frac{1}{(x^2+1)^n} dx$ है, तो $2n I_{n+1} - (2n-1) I_n = $

  • A
    $\frac{(x^2+1)^n}{x} + c$
  • B
    $\frac{x}{(x^2+1)^n} + c$
  • C
    $x(x^2+1)^{n-1} + c$
  • D
    $\frac{x}{(x^2+1)^{n-1}} + c$

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