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explain the functions with examples
A one-one mapping means that original equation is a function and the inverse is also a function.

So for example, y = x3 is one-one because the inverse (y = cubed root of x) is also a function
y = x2 is not one-one because the inverse (y = +- sqrt(x)) is not a function

A function means that there is only one y value for every x value. So the value x = 2 cannot have an answer of y = 2 and y = -2. It can only have one answer y = 2.


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