Drawing math function in Csharp

VietGraph 1.0\VietGraph 1.0 - Finished Product
.............\................................\VietGraph.exe
.............\VietGraph 1.0 - Source Code
.............\...........................\GraphPlotter
.............\...........................\............\bin
.............\...........................\............\...\Debug
.............\...........................\............\...\.....\VietGraph.exe
.............\...........................\............\...\.....\VietGraph.pdb
.............\...........................\............\...\.....\VietGraph.vshost.exe
.............\...........................\............\Expression.cs
.............\...........................\............\ExpressionPlotter.cs
.............\...........................\............\ExpressionPlotter.Designer.cs
.............\...........................\............\Graph.cs
.............\...........................\............\Graph.Designer.cs
.............\...........................\............\Graph.resx
.............\...........................\............\IEvaluatable.cs
.............\...........................\............\Main.cs
.............\...........................\............\Main.Designer.cs
.............\...........................\............\Main.resx
.............\...........................\............\obj
.............\...........................\............\...\Debug
.............\...........................\............\...\.....\Refactor
.............\...........................\............\...\.....\TempPE
.............\...........................\............\...\.....\......\Properties.Resources.Designer.cs.dll
.............\...........................\............\...\.....\VietGraph.csproj.GenerateResource.Cache
.............\...........................\............\...\.....\VietGraph.exe
.............\...........................\............\...\.....\VietGraph.Graph.resources
.............\...........................\............\...\.....\VietGraph.Main.resources
.............\...........................\............\...\.....\VietGraph.pdb
.............\...........................\............\...\.....\VietGraph.Properties.Resources.resources
.............\...........................\............\...\.....\VietGraph.TacGia.resources
.............\...........................\............\...\VietGraph.csproj.FileList.txt
.............\...........................\............\Program.cs
.............\...........................\............\Properties
.............\...........................\............\..........\AssemblyInfo.cs
.............\...........................\............\..........\Resources.Designer.cs
.............\...........................\............\..........\Resources.resx
.............\...........................\............\..........\Settings.Designer.cs
.............\...........................\............\..........\Settings.settings
.............\...........................\............\Resources
.............\...........................\............\.........\appgraph.ico
.............\...........................\............\.........\copy.ico
.............\...........................\............\.........\disk.ico
.............\...........................\............\.........\down.ico
.............\...........................\............\.........\grid.ico
.............\...........................\............\.........\left.ico
.............\...........................\............\.........\origin.ico
.............\...........................\............\.........\polar.ico
.............\...........................\............\.........\polarDown.ico
.............\...........................\............\.........\polarup.ico
.............\...........................\............\.........\range.ico
.............\...........................\............\.........\rectangular.ico
.............\...........................\............\.........\right.ico
.............\...........................\............\.........\scale.ico
.............\...............

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