bcParser.NET is a library written in C# to parse and evaluate mathematical expressions.

A simple example looks like this:

  
MathParser parser = new MathParser();
parser.Expression = "x+sin(y)";
parser.X = 3;  // X and Y are pre-defined (but can be undefined if you like).
parser.Y = 2;
double value = parser.ValueAsDouble;

You may browse MathParser class documentation here.

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