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An input value is the value that you start with. If it helps, you can think of an input value as being a value you type in. So, for instance, if you type 8 * 2 into your calculator, then that's the input. This is contrasted with output, which is the value returned to you by the computer program. In our example, the output would be 16.
Go to the Wolfram Alpha site and type the following in the input box: |x|
an input variable is an input variable
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other names for the input of a function are: 1. x 2. domain