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4. Consider the function f : R x R > R x R defined by f(x,y) = (z + y, z-y). (a) Show that f

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4. Consider the function f : R x R > R x R defined by f(x,y) = (z + y, z-y). (a) Show that f is one-to-one and onto. (b) Find the inverse function f (a, b)

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