I had nothing to do with this code, but it works so here it is...
Describe your function and graph it !
Warnings
All the stuff has been transferred, but computing may take some time, depending on the size of the graph (Width * Height), the complexity of your function, and the performances of your computer (and of your browser)...
No control is made on the evaluation of the function : specify an interval [xmin, xmax] avoiding division by zero and others numerical horrors !
All common expressions should be recognized : cos, sqrt, log, etc. Use * for multiplication and x for the variable, and x * x for x2.
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