જો $630^{\circ} < \theta < 810^{\circ}$ અને $\tan \theta = -\frac{7}{24}$ હોય,તો $\cos \left(\frac{\theta}{4}\right) = $

  • A
    $-\sqrt{\frac{7+5 \sqrt{2}}{10 \sqrt{2}}}$
  • B
    $\sqrt{\frac{7+5 \sqrt{2}}{2 \sqrt{2}}}$
  • C
    $-\sqrt{\frac{5 \sqrt{2}-7}{10 \sqrt{2}}}$
  • D
    $\sqrt{\frac{5 \sqrt{2}-7}{2 \sqrt{2}}}$

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