If \( \cos ^{-1} x-\cos ^{-1} \frac{y}{2}=\alpha \), where
\[-1 \leq \mathrm{x} \leq 1,-2 \leq \....
Question If \( \cos ^{-1} x-\cos ^{-1} \frac{y}{2}=\alpha \), where
\[-1 \leq \mathrm{x} \leq 1,-2 \leq \mathrm{y} \leq 2, x \leq \frac{y}{2} \text {, }\]
then for all \( x, y, 4 x^{2}-4 x y \cos \alpha+y^{2} \) is equal to:
(A) \( 4 \sin ^{2} \alpha-2 x^{2} y^{2} \)
(B) \( 4 \sin ^{2} \alpha-2 x^{2} y^{2} \)
(C) \( 4 \cos ^{2} \alpha+2 x^{2} y^{2} \)
(D) \( 4 \sin ^{2} \alpha \)📲PW App Link - https://bit.ly/YTAI_PWAP 🌐PW Website - https://www.pw.live
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