x/x� +x +1=1/4[x^2+x+1]/x=4x+1+1/x=4x+1/x=3[x^4-x^2+1]/x^2=x^2-1+1/x^2=[x+1/x]^2-2-1=3*3-3=6x^2/[x^4-x^2+1]=1/6
