Compute the coefficients of
> a:=`@@`(D,6)(u)^3; 
#and
> b:=`@@`(D,5)(u)*`@@`(D,6)(u)*`@@`(D,7)(u);
#in the differential polynomial
> c:=`@@`(D,18)(u^3);.

Helppppppp :) TIA

I am very new to Maple and am trying to teach myself until next semester when I will be taking a course.

I am trying to make a GUI based worksheet to display a plot of a vector valued function (in R^2) and its velocity and acceleration vectors. I wrote code in a worksheet and it seems to work, but I am having trouble getting the plot to work when I put the code in a slider (to update continuosly as the value of t changes with the slider). I understand there are differences...