ah, no :\

y=x and y=|x| are not the same. that's the whole problem...
Let me simplify:
Here is 'y = x'

'y = x^2'

'y = (x^2)^0.5'


One more option -
'y = x^0.5'

'y = (x^0.5)^2
[IMG]https://img14.imageshack.us/img14/444...eaterthen0.png[/IMG]

non of these is actually the same as 'y=x' which you can get to by multiplying the 0.5 and 2...
(y=(x^2)^0.5 -> y= x^(2*0.5) -> y=x^1 -> y=x)