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[" 2.If "x=3" and "y=-1" ,find the value...

[" 2.If "x=3" and "y=-1" ,find the values of each of the following using in iden "],[[" (i) "(9y^(2)-4x^(2))(81y^(4)+36x^(2)y^(2)+16x^(4)),],[" (ii) "((3)/(x)-(x)/(3))((x^(2))/(9)+(9)/(x^(2))+1)," (iii) "((x)/(7)+(y)/(3))((x^(2))/(49)+(y^(2))/(9)-(xy)/(21))]]

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