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[" 15.If "x=1+sqrt(2)" and "y=1-sqrt(2)"...

[" 15.If "x=1+sqrt(2)" and "y=1-sqrt(2)" ,find the value of "(x^(2)+y^(2))],[" Ex."15." If "x=1+sqrt(2)" and "y=1-sqrt(2)" ,find the value of "(x^(2)+y^(2))]

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