Sharp EL-506P Instruction Manual page 69

For the accuracy of functions other than show above, the error is ±1 at the 10th
digit, es a rule . (In the scientific notation system, the error is ±1 at the lowest
digit of mantissa display.)
However, the accuracy will become low around singular points and inflection
points of functions .
Therefore, errors are accumulateci in each stage of the continuous calculations,
causing the accuracy to deteriorate .
End of Supplementary 2 - Error Conditions
67