Steps:
1. Enter the x array - separate values by
spaces (ex. 1 2.5 4 5)
2. Enter the y array - separate values by spaces (ex. -4.8
7.2 11 15.1)
3. Press the "check input" button
4. Enter the number of decimal places for the divided
difference table
5. Enter a value of 'X' to be interpolated
6. Press the "Interpolate" button
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