यदि $x_1, x_2, x_3$ समीकरण $x^3-x^2 \tan \theta+x \tan ^2 \theta+\tan \theta=0$ के वास्तविक मूल हैं और $0 < \theta < \frac{\pi}{4}$ है,तो $\theta=\frac{\pi}{12}$ पर $\tan ^{-1} x_1+\tan ^{-1} x_2+\tan ^{-1} x_3$ का मान क्या होगा?

  • A
    $\frac{\pi}{6}$
  • B
    $\frac{\pi}{4}$
  • C
    $\frac{\pi}{3}$
  • D
    $\frac{\pi}{2}$

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