જો $0 < \theta < \frac{\pi}{2}$ અને $\tan 3 \theta \neq 0$ હોય,તો $\tan \theta + \tan 2 \theta + \tan 3 \theta = 0$ થાય જો $\tan \theta \cdot \tan 2 \theta = k$ હોય,જ્યાં $k =$

  • A
    $1$
  • B
    $2$
  • C
    $3$
  • D
    $4$

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