यदि $A$ समीकरण $\cos ^2 x = \cos ^2 \frac{\pi}{6}$ का हल समुच्चय है और $B$ समीकरण $\cos ^2 x = \log _{16} P$ का हल समुच्चय है जहाँ $P + \frac{16}{P} = 10$,तो $B - A =$

• A
  $\{x \in R \mid x = 2n\pi \pm \frac{\pi}{4}, 2n\pi \pm \frac{\pi}{3}, n \in Z\}$
• B
  $\{x \in R \mid x = 2n\pi \pm \frac{\pi}{3}, 2n\pi \pm \frac{2\pi}{3}, n \in Z\}$
• C
  $\{x \in R \mid x = 2n\pi \pm \frac{\pi}{6}, 2n\pi \pm \frac{\pi}{12}, n \in Z\}$
• D
  $\{x \in R \mid x = 2n\pi \pm \frac{\pi}{8}, 2n\pi \pm \frac{\pi}{16}, n \in Z\}$