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Multipresicion calculator, based on Bigdecimal Java class .
It has a library (BigMath) that makes calculations with Bigdecimal.
It has also an expressionparser to parse the user input.
It allows you to store user defined variables and functions .
You can operate with them to be used for calculations or for creating new functions with composition.
With the new version, you can also calculate the derivative of a function.
JDK-17 compatibility