જો $\theta $ એ લઘુકોણ છે અને $\sin \frac{\theta }{2} = \sqrt {\frac{{x - 1}}{{2x}}} $, તો $\tan \theta  = . . .$

  • A

    ${x^2} - 1$

  • B

    $\sqrt {{x^2} - 1} $

  • C

    $\sqrt {{x^2} + 1} $

  • D

    ${x^2} + 1$

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