(a) What is a one-to-one function? How can you tell if a function is one-to-one by looking...

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(a) What is a one-to-one function? How can you tell if a function is one-to-one by looking at its graph?
(b) If f is a one-to-one function, how is its inverse function f-1 defined? How do you obtain the graph of f-1 from the graph of f?
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