| X | Approximate | exact | Error |
| 0.1 | −0.8995213036517695 | −0.9003720042142316 | 8.50700 × 10−5 |
| 0.2 | −0.802128865390869 | −0.8026635062211873 | 5.34640 × 10−5 |
| 0.3 | −0.7082701011953134 | −0.7087243595167709 | 4.54258 × 10−5 |
| 0.4 | −0.6197534089903017 | −0.6200856060823358 | 3.32197 × 10−5 |
| 0.5 | −0.537656212633913 | −0.5379146158215734 | 2.58403 × 10−5 |
| 0.6 | −0.46278732644419796 | −0.46297918136730526 | 1.91854 × 10−5 |
| 0.7 | −0.39550965012926387 | −0.3956578669883961 | 1.48216 × 10−5 |
| 0.8 | −0.3358795169387979 | −0.33598581616684337 | 1.062992 × 10−5 |
| 0.9 | −0.2836276012488011 | −0.2837218018316331 | 9.42005 × 10−6 |
| 1 | −0.2384226435296663 | −0.23842281152968955 | 1.6800002 × 10−7 |