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I have been working on my final math project and have run into this issue. The project is to create a photo using functions. In order to create the vertical lines needed in some portions, I have been using linear equations with high slopes, which works well enough. My issue is that individual functions sometimes will not show until I zoom in or out a little, in which case one of the other linear equations will end up disappearing. Does anyone know how I can fix this?
The same problem 
Please post your .ggb file
you can use segments, or curve, or reflected functions
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