यदि $I_1 = \int \frac{e^x}{e^{4x} + e^{2x} + 1} dx$ और $I_2 = \int \frac{e^{-x}}{e^{-4x} + e^{-2x} + 1} dx$ है, तो $I_2 - I_1 =$

  • A
    $\frac{1}{2} \log \left(\frac{e^{2x} - e^{-2x} + 1}{e^{2x} + e^{-2x} - 1}\right) + c$
  • B
    $\frac{1}{2} \log \left(\frac{e^{2x} - e^{-2x} - 1}{e^{2x} + e^{-2x} + 1}\right) + c$
  • C
    $\frac{1}{2} \log \left(\frac{e^{2x} + e^{-x} + 1}{e^{2x} + e^{-x} - 1}\right) + c$
  • D
    $\frac{1}{2} \log \left(\frac{e^x + e^{-x} - 1}{e^x + e^{-x} + 1}\right) + c$

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