यदि $\cos ^{-1} x-\cos ^{-1} \frac{y}{3}=\alpha$,जहाँ $-1 \leq x \leq 1$,$-3 \leq y \leq 3$,और $x \leq \frac{y}{3}$ है,तो सभी $x, y$ के लिए $9 x^2-6 x y \cos \alpha+y^2$ का मान ज्ञात कीजिए।

  • A
    $\sin ^2 \alpha$
  • B
    $3\sin ^2 \alpha$
  • C
    $9\sin ^2 \alpha$
  • D
    $\frac{4}{9}\sin ^2 \alpha$

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