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if [latex] a=\frac { \sqrt { 5 }+1 }{ \sqrt { 5 } – 1 } [/latex] and  b= [latex] \frac { \sqrt { 5 } -1 }{ \sqrt { 5 } +1 } [/latex] then the value of

[latex] \frac { { a }^{ 2 }+ab+{ b }^{ 2 } }{ { a }^{ 2 }-ab+{ b }^{ 2 } } [/latex] is

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