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12. 8 points Let f(x) and g(x) be two linear functions. Note: a function is linear if there exists a, b E R such that

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12. 8 points Let f(x) and g(x) be two linear functions. Note: a function is linear if there exists a, b E R such that f(x) = ax + b. (a) Prove or disprove: fog=gof. (b) Prove or disprove: fog and go f are linear functions

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