[" 16.If "cos^(-1)x-cos^(-1)(y)/(2)=alph...

[" 16.If "cos^(-1)x-cos^(-1)(y)/(2)=alpha," then "4x^(2)-4xy cos alpha+y^(2)" is equal to "],[[" (a) "4sin^(2)alpha," (b) "-4sin^(2)alpha," (c) "2sin2 alpha," (d) "4]]

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