hi,

if i run the below statements, the last 2 cause Maple 12 Student Edition to chug along for a minute then generate a very long answer, like a page worth. it's like it can't figure out the answer and dumps a bunch of garbage. all i am trying to do is a 2nd derivative.

restart;
dist := t-> sqrt((-27-(60+23*sin(t))*t/sqrt(2))^2+(-11*t+(60+23*sin(t))*t/sqrt(2))^2);
'dist(t)' = dist(t);
Ddist := D(dist);
'Ddist(23/60)' = evalf(Ddist(23/60));
tmax := fsolve((D(Ddist))(t), t = 0 .. 1);
'Ddist(tmax)' = evalf(Ddist(tmax));

if i change the 2nd line to the below, then it works fine, and the last two statements print an answer.

dist := t-> sqrt((-17-(60+15*cos(t))*t/sqrt(2))^2+(-8*t+(60+15*cos(t))*t/sqrt(2))^2);

is this a problem with Maple 12, or am i doing something wrong here ?

thanks.