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Online ProgramWhich equation(s) listed below can be proved for all real numbers?
I. \((x-{y)}^2=(x-y)(x+y)\)
II. \({\left(x^2+y^2\right)}^2={\left(x^2+y^2\right)}^2+{\left(2xy\right)}^2\)
III. \({\left(x^2+y^2\right)}^2={(x^2-y^2)}^2+{(2xy)}^2\)