Explicație pas cu pas:
.,..,.,.,.,.,.......,.,.,..,.,.,.,.,.,..,
x+ 1/x = 2
x+ 1/x -2 =0
Amplificam cu x
x^2 + 1 - 2x/x=0
x^2 -2x + 1 = 0
(x-1)^2 = 0
x-1=0
x=1
1^2 + 1/1^2 =1+1=2
x^2 + 1/x^2 = 2
