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Explain why the following statement must be True, or provide a counterexample to show that it can be False. If f and g are one-to-one

Explain why the following statement must be True, or provide a counterexample to show that it can be False. If f and g are one-to-one functions defined on all of R , then the function h(@) =f(@) +g(@) is also one-to-one

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