Problem:
Give numerical evidence to evaluate

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Visualization:
Using Limits (from the University of Arizona):

1. After starting up the program, you are prompted "Would you like some instructions?" Use the arrow keys to move to either Yes or No and then press .
2. If you choose Yes then read the instructions and press when you are ready to proceed.
3. Use the arrow keys to highlight Function Operations and press .
4. Use the arrow keys to highlight Create Function and press .
5. At the prompt, Enter function:, type (x^2-1)/(x^2+1) .
6. Use the arrow keys to move to Limit as x -> +?? and press .
7. Press several times to get the following table: