यदि $\sin \left( x + \frac{4\pi}{9} \right) = a$ और $\frac{\pi}{9} < x < \frac{\pi}{3}$ है,तो $\cos \left( x + \frac{7\pi}{9} \right)$ का मान ज्ञात कीजिए:

  • A
    $\frac{\sqrt{1 - a^2} - a\sqrt{3}}{2}$
  • B
    $\frac{1 - a^2 + a\sqrt{3}}{2}$
  • C
    $\frac{a\sqrt{3} - \sqrt{1 - a^2}}{2}$
  • D
    $\frac{-\sqrt{1 - a^2} - a\sqrt{3}}{2}$

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