જો $y(x)=\tan ^{-1}\left(\frac{\sqrt{1+a^2 x^2}-1}{a x}\right)$ અને $\left(1+a^2 x^2\right) y^{\prime \prime}+g(x) y^{\prime}=0$ હોય, તો સમીકરણ $1+a^2 x^2+g(x)=0$ ના બીજનો સરવાળો કેટલો થાય?

  • A
    $2 a$
  • B
    $-2 a^2$
  • C
    $2$
  • D
    $-2$

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