Recall from the video that interaction terms involve products of features.

Suppose we have two features `x`

and `y`

, and we use models that process the features as follows:

- βx + βy + ββ
- βxy + βx + βy
- βx + βy + βx^2 + βy^2

where β is a coefficient in your model (not a feature).

Which expression(s) include interaction terms?

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