यदि $a_1, a_2, a_3, \dots, a_n$ समांतर श्रेणी में हैं जिनका सार्व अंतर $d$ है, तो $\tan [\tan^{-1} (\frac{d}{1 + a_1a_2}) + \tan^{-1} (\frac{d}{1 + a_2a_3}) + \dots + \tan^{-1} (\frac{d}{1 + a_{n-1}a_n})] = $

  • A
    $\frac{a_1 - a_n}{1 + a_1a_n}$
  • B
    $\frac{a_n - a_1}{1 - a_1a_n}$
  • C
    $\frac{a_n - a_1}{1 + a_1a_n}$
  • D
    $\frac{a_1 + a_n}{1 + a_1a_n}$

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