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The Tutorial Section includes step-by-step tutorials on specific topics both for beginning users as well as experts.
Parameters are often used in functions like
f(x)=a*x² to explore the influence of a parameter. To use a parameter you need to define it, in this case
a, before you define the function. If you don't do that the function won't be accepted. The parameter a can be a simple number (enter at input-line something like
a=2) or a slider (nothing more than a visible free number)
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