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sketch a graph whose domain is the interval [0, infinity) but whose domain must be restricted to [0,4] so that the function can have an inverse. (The only one i can think of is a parabola but she said we cant use that one)

Consider the 2 statements:
I. if f(a)=b then f(inverse)(b)=a
II. if f(inverse)(b)=a then f(a)=b
Which statement is NOT necessarily true if f(x) does not pass the horizontal line test and WHY?

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