Question: The function simplify above can perform all numerical computations, but stops whenever it encounters a variable. It cannot do any better, in fact, because it

The function simplify above can perform all numerical computations, but stops whenever it encounters a variable. It cannot do any better, in fact, because it does not know the values of variables.

If we specify values for variables, we can then use those values in the computation, replacing each variable whose value is specified with the value itself.

A variable valuation is a mapping from variables to their values; we can represent it simply as a dictionary associating to each variable a number:

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