मूल्यांकन करें: $\tan ^{ - 1}\left(\frac{{{c_1}x - y}}{{{c_1}y + x}}\right) + \tan ^{ - 1}\left(\frac{{{c_2} - {c_1}}}{{1 + {c_2}{c_1}}}\right) + \tan ^{ - 1}\left(\frac{{{c_3} - {c_2}}}{{1 + {c_3}{c_2}}}\right) + ... + \tan ^{ - 1}\left(\frac{1}{{{c_n}}}\right)$

  • A
    $\tan ^{ - 1}\left(\frac{y}{x}\right)$
  • B
    $\tan ^{ - 1}(yx)$
  • C
    $\tan ^{ - 1}\left(\frac{x}{y}\right)$
  • D
    $\tan ^{ - 1}(x - y)$

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