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

[" If "cos^(-1)x-cos^(-1)(y)/(2)=alpha," then "4x^(2)-4xy cos alpha+y^(2)" is equal to "],[[" (1) "2sin2 alpha," (2) "4," (3) "4sin^(2)alpha]]

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