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 $9x^2 - 6xy \cos \alpha + y^2$ का मान क्या होगा?

  • A
    $9 \sin ^2 \alpha$
  • B
    $3 \sin ^2 \alpha$
  • C
    $9 \cos ^2 \alpha$
  • D
    $6 \sin ^2 \alpha$

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