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'x + y' and 'y + x' are equivalent.
'(x + y) * (x - y)' and 'x^2 + y^2' are not equivalent.
'(x + y) * (x - y)' and 'x^2 - y^2' are equivalent.
My fellow monks
Can't tell (I'm NSA/FBI/HS/...)
Others (explain your deviation)
Results (55 votes). Check out past polls.