यदि $f(x)$,$g(x)$ का प्रति-अवकलज (anti-derivative) है और $\int f(x) g(x) (1 + f^2(x)) dx = F(x)$ है,तो $F(x) =$

  • A
    $\frac{(1 + f^2(x))^2}{4} + C$
  • B
    $\frac{(1 + f^2(x))^2}{2} + C$
  • C
    $\frac{f^2(x) g(x)}{4} + C$
  • D
    $\frac{g^2(x) f(x)}{4} + C$

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