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

[" 20.If "cos^(1)x-cos^(-1)(y)/(2)=alpha" ,then "4x^(2)-4xy" cos "a+y^(2)" is equal to "],[[" (A) "-4sin^(2)alpha," (i) "4sin^(2)alpha," (C) "4],[hline]]

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