(2) Indicate the relationship between the graph of the function $y=|x|$ and the graph of the function $y=\sqrt{x^{2}-2|x|+1}$.
(2) The function $y=\sqrt{x^{2}-2|x|+1}$ is equivalent to $y=|| x|-1|$. Its graph can be obtained by first shifting the graph of the function $y=|x|$ down by 1 unit, and then reflecting the part of the resulting graph that is below the $x$-axis about the $x$-axis.