જો $\int \frac{x^4+1}{x^2+1} dx = Ax^3 + Bx^2 + Cx + D \tan^{-1} x + E$ હોય,તો $A+B+C+D=$

  • A
    $\frac{3}{2}$
  • B
    $\frac{4}{3}$
  • C
    $\frac{1}{3}$
  • D
    $\frac{2}{3}$

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