Tags curve, derivative
curves, deriving coordinate functions
Jens Akhøj Nielsen shared this problem 4 years ago
After defining a curve, say r (only tried 2D), you can get x(r) and y(r) getting two functions f(t)=x(r(t)) and g(t)=y(r(t)).
If you start writing derivative(f,t) in Input, the plot is shown, but when you hit Enter, it comes up as Undefined.
The same works in CAS without problems, it seems.
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Which version of GeoGebra and OS?
Please post your file
I can confirm Jens observation and it is not helpful to post a file, because the result is an undefined function.
Try: a=curve(3u²,2u*exp(-u), u, -10,10) and define f(t)=x(a) and g(t)=y(a)
Then you can see the described problem.
My system: Windows 10 and GG 5.0533
Thank you, my OS and GG is the same.
Btw. as far as I can see, x(a) and y(a) might be obvious, but it seems it's undocumentet.
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