જો $\cos ^{-1} x - \cos ^{-1} \frac{y}{2} = \alpha$,જ્યાં $-1 \leq x \leq 1, -2 \leq y \leq 2, x \leq \frac{y}{2}$ હોય,તો તમામ $x, y$ માટે $4x^2 - 4xy \cos \alpha + y^2$ ની કિંમત શું થાય?

  • A
    $2 \sin ^2 \alpha$
  • B
    $4 \sin ^2 \alpha$
  • C
    $4 \cos ^2 \alpha + 2x^2y^2$
  • D
    $4 \sin ^2 \alpha - 2x^2y^2$

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