दिया गया है कि $\int \frac{1}{x^2+a^2} dx = \frac{1}{a} \tan^{-1}\left(\frac{x}{a}\right) + C$. यदि $\int \frac{1}{x^4+3x^2+1} dx = a \cdot \tan^{-1}\left(\frac{b(x^2-1)}{x}\right) + c \cdot \tan^{-1}\left(\frac{d(x^2+1)}{x}\right) + k$, जहाँ $k$ समाकलन का एक स्थिरांक है, तो $5(c+d+ab) = $

  • A
    $3$
  • B
    $5$
  • C
    $8$
  • D
    $10$

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