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For the best PDF to ePUB result you really must use the OCR method. That is still the best method and after the OCR you have to check the results with the PDF to ensure it is correct.
For example ABBYY has support for tables, but I would not recommend exporting to ePUB directly. It will generate a mess.
Equations are troublesome, since MathML is not supported in ePUB2 (it should be in ePUB3, but most readers or applications cannot read ePUB3). I usually recreate the equation at the Codecogs site and create a SVG from it. That one can be easily imported into an ePUB.
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