જો ${x_1}, {x_2}, {x_3}, {x_4}$ એ સમીકરણ ${x^4} - {x^3}\sin 2\beta + {x^2}\cos 2\beta - x\cos \beta - \sin \beta = 0$ ના બીજ હોય,તો ${\tan ^{ - 1}}{x_1} + {\tan ^{ - 1}}{x_2} + {\tan ^{ - 1}}{x_3} + {\tan ^{ - 1}}{x_4} = $

  • A
    $\beta $
  • B
    $\frac{\pi }{2} - \beta $
  • C
    $\pi - \beta $
  • D
    $ - \beta $

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