If \cos^{-1} x - \cos^{-1} y/2 = α , then 4x^2 - 4xy cos α + y^2 is equal to

BITSAT 2015 Paper

Section: Mathematics

Question : 92 of 150

Marks: +1, -0

If cos−1 x - cos−1

= α ,
then 4x2 - 4xy cos α + y2 is equal to

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