$\frac{{\sqrt {1 + \sin x} + \sqrt {1 - \sin x} }}{{\sqrt {1 + \sin x} - \sqrt {1 - \sin x} }} = $ (જ્યારે $x$ એ $II^{nd}$ ચરણમાં હોય)

  • A
    $\sin \frac{x}{2}$
  • B
    $\cot \frac{x}{2}$
  • C
    $\tan \frac{x}{2}$
  • D
    $\sec \frac{x}{2}$

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જો $\cos(\alpha + \beta) = \frac{4}{5}$ અને $\sin(\alpha - \beta) = \frac{5}{13}$,જ્યાં $0 \le \alpha, \beta \le \frac{\pi}{4}$ હોય,તો $\tan 2\alpha = $

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