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4. Suppose the a function of two variables f(x, y) satisfies f = af+bfy Prove that if there is a constant M >0 such

4. Suppose the a function of two variables f(x, y) satisfies f = af+bfy Prove that if there is a constant M >0 such that f(x, y)| < M for all (x, y), then f is a constant.

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