The function is .

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Horizontal line test:

A function has an inverse if and only if no horizontal line intersects its graph of the function in at most one point.

Graph :

Graph the function .

Draw a horizontal line .

Observe the graph:

The horizontal line touches the graph of the function at more than once.

The function is not an one-to-one, because it does not satisfy the horizontal line test.

Therefore the inverse of the function does not exist.

The inverse of the function does not exist.