यदि $\cos ^{2} \theta-\sin ^{2} \theta=\frac{1}{3},$ जहाँ $0 \leq \theta \leq \frac{\pi}{2}$ है,तो $\cos ^{4} \theta-\sin ^{4} \theta$ का मान क्या है?

  • A
    $\frac{1}{3}$
  • B
    $\frac{2}{3}$
  • C
    $\frac{1}{9}$
  • D
    $\frac{2}{9}$

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