If x+1/x=1then,x2+3x+1/x2+7x+1
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x+(1/x)=1 so (x^2)+1=x
(x^2+3x+1)/(x^2+7x+1)=((x^2+1)+3x)/((x^2+1)+7x)=(x+3x)/(x+7x)=4x/8x= 1/2
so ans is 1/2 =0.5
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