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[" 2.If "x=3" and "y=-1," find the values of each of the following using in identity: "],[" (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)quad " (iii) "((x)/(7)+(y)/(3))((x^(2))/(49)+(y^(2))/(9)-(xy)/(21))],[" (iv) "((x)/(4)-(y)/(3))((x^(2))/(16)+(xy)/(12)+(y^(2))/(9))quad " (v) "((5)/(x)+5x)((25)/(x^(2))-25+25x^(2))]

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