If cos –1 x – cos –1 y 2 = , then 4x 2 – 4xy cos α + y 2 is equal to
Mathematics · JEE Main · NTA Exams — Sets, Relations and Functions
If cos–1 x – cos–1 \(\frac{\mathrm{y}}{2}=\alpha,\) then 4x2 – 4xy cos α + y2 is equal to
- –4 sin2 α
- 4 sin2 α
- 4
- 2 sin 2α
Answer
(B) 4 sin 2 α
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