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[" 1f "cos^(-1)x-cos^(-1)(y)/(2)=alpha" ...

[" 1f "cos^(-1)x-cos^(-1)(y)/(2)=alpha" ,then "4x^(2)-4xy cos alpha+y^(2)" isequal to "],[[(a)-4sin^(2)alpha,(b)4sin^(2)alpha],[(c)4," (d) "2sin2 alpha]]

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