1.If cos−1x−cos−1y=α\cos^{-1} x - \cos^{-1} y = \alphacos−1x−cos−1y=α, then 4x2−4xycosα+y24x^2 - 4xy \cos \alpha + y^24x2−4xycosα+y2 is equal toa.2sin2α2\sin^2\alpha2sin2αb.444c.4sin2α4\sin^2\alpha4sin2αd.−4sin2α-4\sin^2\alpha−4sin2αLogin to continueOnly logged in users canattempt or see the solution.
