if x+1/x =3 find x square+1/x square
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(x+1/x)^2=3^2{squaring both sides}
x^2+1/x^2+2×x×1x=9
x^2+1/x^2=9-2
x^2+1/x^2=7
x^2+1/x^2+2×x×1x=9
x^2+1/x^2=9-2
x^2+1/x^2=7
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