| X | Approximate | exact | Error |
| 0.1 | −0.9002504780675539 | −0.9003359656417863 | 8.54875 × 10−6 |
| 0.2 | −0.8025767352176667 | −0.8026285239500627 | 5.17887 × 10−6 |
| 0.3 | −0.708645412135447 | −0.708691048100522 | 4.56359 × 10−6 |
| 0.4 | −0.6200218727210606 | −0.620054460305121 | 3.25875 × 10−6 |
| 0.5 | −0.5378602548079978 | −0.537885988536737 | 2.57337 × 10−6 |
| 0.6 | −0.46293432379048866 | −0.4629532793191295 | 1.89555 × 10−6 |
| 0.7 | −0.39562010376657514 | −0.3956347618473343 | 1.46580 × 10−6 |
| 0.8 | −0.3359548541057984 | −0.3359654659587617 | 1.061185 × 10−6 |
| 0.9 | −0.28369486530106436 | −0.2837040774760006 | 9.21217 × 10−7 |
| 1 | −0.2384073559560102 | −0.23840752394671919 | 1.67990 × 10−7 |