$\int (1+e^{-x})^{-1} dx =$

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

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$\int \tan ^8 x \cdot \sec ^4 x \, dx = $ . . . . . . $+ C$.

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