The answers to exercise marked [BB] can be found in the Back of the Book.
In each of (he following cases, explain why the given function is not one-to-one. Then restrict the domain of the function to as large a set as possible so as to make a one-to-one function.
(a) ƒ = {a, α), (b, β), (c, γ), (d, α)}
(b) [BB]ƒ: R → R defined by f(x)= −4x2 + 12x −9
(c) f:R→ R defined by ƒ(x) = sin x
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