Question:medium

If \[ \cos^{-1} x - \frac{\cos^{-1} y}{2} = \alpha, \] then \[ 4x^2 - 4xy \cos \alpha + y^2 \] is equal to:

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Use trigonometric identities to reduce algebraic expressions.
Updated On: Mar 23, 2026
  • \(2\sin 2\alpha\)
  • \(4\)
  • \(4\sin^2\alpha\)
  • 4-4sin²α
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The Correct Option is C

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