$\tan 20^{\circ} + \tan 40^{\circ} + \tan 60^{\circ} + \cdots + \tan 180^{\circ}$ નું મૂલ્ય કેટલું છે?

  • A
    $1$
  • B
    $-1$
  • C
    $0$
  • D
    આમાંથી કોઈ નહીં

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$(\sec A + \tan A - 1)(\sec A - \tan A + 1) - 2\tan A = $

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