If ^ -1 x- ^ -1 y 2 = , then 4 x 2 – 4 xy cos α + y 2 is equal to

Mathematics · JEE Main · NTA ExamsTrigonometry

If \(\cos ^{-1} x-\cos ^{-1} \frac{y}{2}=\alpha,\)then 4x2 – 4xy cosα + y2 is equal to
  1. 4
  2. 2sin2α
  3. –4sin2α
  4. 4sin2α

Answer

(D) 4sin 2 α

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