I have get a functionsystem:

Hallo, I have a function in form f(x(t)), how can i define it in maple and diff it? thanks a lot ex ante.

Hallo, with "textplot" one can get a horizontal text. Can man get an inclined text also, for example, along an vertical line? thanks jahn

I wanted to solve a differential equation and followed the examples in Maple manual exactly: ode := {(2*t*x*q+x-4*t*x^2*(2*y(v)-1))*(diff(y(v), v))-1 = 0}; ic := {y(0) = 1/2}; soln := dsolve(`union`(ode, ic), {y(v)}); But I got neither results nor error informations. Does it mean, "ode" has no solution? In such case, how can I get some tips from Maple? thanks a lot.

From "t*x^3-q*x-2q^2=0" I got a complicated real solution. Then I want to evaluate "y= -x/2 -(x+2q)^2/(8t*x^2)" with the solution. But my Maple exited without results. I have tried many times. It was alway so. How can I evaluate it? Do I need some package? Or my memory (526M) is too small? Thanks