$\tan 9^{\circ} - \tan 27^{\circ} - \tan 63^{\circ} + \tan 81^{\circ}$ નું મૂલ્ય શું છે?

  • A
    $2$
  • B
    $3$
  • C
    $4$
  • D
    આમાંથી કોઈ નહીં

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$\log \tan 1^{\circ} + \log \tan 2^{\circ} + \log \tan 3^{\circ} + \ldots + \log \tan 89^{\circ}$ નું મૂલ્ય કેટલું થાય?

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