User guide

You can check the value of a variable by typing in the variable x and
E. If cleared correctly, the variable will no longer output a constant value.
Format is important when storing a constant for a variable. Always store a
constant into a variable not the other way around. If you switch the order,
the calculator will report an error. The ability to overcome error messages
will come with practice.
4.2 Storing a function
In addition to storing constant values, you can also store entire functions.
The calculator command for storing an entire function is known as Define.
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