SetAccuracy
 Usage
Notes
 Further Examples
When an expression contains machine-precision real numbers Mathematica tries to do all computations with machine precision.
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This causes a loss of accuracy. One of the summands had an accuracy of  but the result has a much lower accuracy.
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By raising the accuracy of each subexpression, you can increase the accuracy of the overall result.
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Adding two numbers of the same accuracy gives a result which is less accurate by one binary bit.
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