જો $A = 580^\circ$ હોય,તો નીચેનામાંથી કયું સાચું છે?

  • A
    $2 \sin \left( \frac{A}{2} \right) = \sqrt{1 + \sin A} - \sqrt{1 - \sin A}$
  • B
    $2 \sin \left( \frac{A}{2} \right) = -\sqrt{1 + \sin A} + \sqrt{1 - \sin A}$
  • C
    $2 \sin \left( \frac{A}{2} \right) = -\sqrt{1 + \sin A} - \sqrt{1 - \sin A}$
  • D
    $2 \sin \left( \frac{A}{2} \right) = \sqrt{1 + \sin A} + \sqrt{1 - \sin A}$

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

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જો $\sin (\alpha - \beta ) = \frac{1}{2}$ અને $\cos (\alpha + \beta ) = \frac{1}{2}$ હોય,જ્યાં $\alpha$ અને $\beta$ ધન લઘુકોણ છે,તો

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