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Parametric curves are entered as two equations in terms of t - separated by a semicolon (see regional issues).
x = 6cos t ; y = 6sin 3t
Cartesian and Inverse Cartesian functions have an "implied domain" - the bounds of the axes you have drawn the function on. If you have not explicitly set a domain, the graph tool can automatically determine a suitable domain from the axes it is using. For parametric graphs, there is not a natural domain that can be easily determined. To counter this problem, the graph tool uses a default domain for parametric graphs.
Parametric graphs 0 ≤ t ≤ 20
In most cases the default domains produce acceptable results. Sometimes you may need to override the default domains in order to create the result you are after.
If you use a comma as a decimal point (eg 3,2) you must use a colon to separate the two parts of a parametric equation.
x = 6cos t : y = 6sin 3t