Example 2 §2.6

  xn      yn       Actual     Abs err  % rel err
1 1 1 .0000  0
1.1 1.02 1.0212 .0012 .12
1.2 1.0424 1.0450 .0025 .24
1.3 1.0675 1.0714 .0040 .37
1.4 1.0952 1.1008 .0055 .50
1.5 1.1259 1.1331 .0073 .64