જો $\sin \theta = -\frac{4}{5}$ અને $\theta$ ત્રીજા ચરણમાં હોય,તો $\cos \frac{\theta}{2} = $

  • A
    $\frac{1}{\sqrt{5}}$
  • B
    $-\frac{1}{\sqrt{5}}$
  • C
    $\sqrt{\frac{2}{5}}$
  • D
    $-\sqrt{\frac{2}{5}}$

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જો $\sin \alpha = \frac{336}{625}$ અને $450^\circ < \alpha < 540^\circ$ હોય,તો $\sin \left( \frac{\alpha}{4} \right) = $

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