I have found the second derivative of a function, but am unable to identify the correct command in maple that will allow me to solve for my variable when the derivative is equal to zero. I am attempting to identify the points of inflection. I thought that the command would be similar to the one I used for the first derivative, but it is not working. This is what I tried. (D(D(f)(x)),=0.0,x); I used D(D(f)(x)); to find my second derivative. I used D(f)(x); to find my first derivative and (D(f)(x)),=0.0,x) to find all points where x was equal to zero for my first derivative. I have also tried (D@@2)(f); with no success.

Hi I need to use the 'del' operator form with both subscript and superscript acting on it. I would for example like to be able to differentiation of a function that combines a number of vectors with respect to a particular vector. I then need to take the components for example (x) corresponding to the subscript on the del operator. Is there an easy way to do this? I can perhaps make it simpler by just using the standard derivative, but dont know how to do this with respect to a vector. Could someone help out a newbie here. I can then take the dot product with a unit vector in the x direction to obtain just the x component.

My question is: (Frent Analysis)
I have this vector function S:=t-> <t^3,3*t,t^4>
I got S(1) wich is <1,3,1>
Also, I got TNBFrame(s(t),t);
and tnb1:=eval(%,t=1) for t=1
I got the Normal Vectot N, Binormal Vector B,the curvature(s(t),t), and curv:=eval(%,t=1);

the radius is rc:=1/curv;

the question:
Armed with this knowledge, use Maple to find the equation of the osculation circle to the curve s(t) at t=1. Plot the curve and the osculation circle on the same plot. Also, plot the three vectors, T,N, and B, at the point s(1), with different colors, at the same plot as the curve and the circle.

Hi, I am trying to solve these 6 equations with 6 unknowns. Unfortunately, "fsolve" does not give numerical results. Please let me know if there are other commands that I can use. I am using Maple 10.06 (Build ID 255401). restart; C := 2; TY := .9; Y := Vector(1 .. C, TY/C); TM := 1; DL := 5; eq1 := X1 = (Y[1]+Z2)/TM; eq2 := X2 = (Y[2]-Z2)/M2; TX := X1+X2; eq3 := M2 = (1-X1)*TM+X1/(1/TM+W1); W0 := Y[1]/TM^2+Y[2]/M2^2; EF := W0/(1-TX); eq4 := W2 = EF+X1*min(W2, DL); eq5 := W1 = (TX*EF-X2*W2)/X1; eq6 := Z2 = Y[2]*max(0, W2-DL)/W2; fsolve({eq2, eq5, eq1, eq3, eq6, eq4}, {M2, X1, X2, Z2, W1, W2});

I am trying to get "contourplot" to label the curves it produces. Is this possible? How? An associated question: Can I force the values at which the level curves (contours) are produced, e.g., show the contours for f(x,y) = 5, 10, 15, and 20. Thanks for your help. Tom

I have these equations.

I'm continuing to work on my Maplet with the question bank, and can succesfully read in files outside of the Maplet using the readline command and parse. However, this is limiting in the fact that the user has to type in the name of the file in a Maple command line. I would like to use the FileDialog to have them select the file with the questions and answers. It's easy to use RunDialog with to run the FileDialog, but once they've selected the file, how can I assign that "string," say, ["E:\questionbank.txt"] to a variable that I can use outside of the actual Maplet code? I need to throw it to the readline procedure I created so it can read each line and parse them, etc.

What's the simplest MAPLE command that would change

into

I have following expression.

There is one for yhat under "Roman Extended Lower Case", but for some reason there isn't one for x. Why is that the case? Am I missing something? Problably so. Please help. Thanks much.

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 am a new user of Maple. Please tell me, why Maple can't sort : 1+sqrt(3) and 1-sqrt(3) ? Thankyou !

Im trying to author a maplet which executes numerical integration on a function for an interval. Here is what I have so far. This is a the part of the assignment that didn't require maplet format. (This part I got to work) restart; a:= 1; b := 3; f:=x->100/x^2*sin(10/x); L:=[];# which is list of lists ListOfEndPts:=[b]; found := false; MaxNoPasses:=70; tolerance:=1.0e-4; simpAB:=evalf(student[simpson](f(x),x=a..b,2));app:=0; for PassNo from 1 to MaxNoPasses while not found do print("**********************************************"); middle := (a+b)/2.0: print(`Pass number` = PassNo);

Hello Is there any possibility to check how long solve will need for a solution? I have to solve a littlebit complex equation set, so solve seems to need a little longer than usual. In my case I have tryed it for about 2 hours .. than I had to turn of my notebook. If it would be possible to check if solve would work for month, weeks, days or hours it would be a great help. us rene

Hi. I tried to solve some excersices but with this one I've got a little problem. I was asked to calculate the area of a circlesegment with radius R and midpointcorner 2*alpha. I have chosen the straigt side of the circlesegment to be parallel with the y axis.

I get these formulas in polarcoördinates.

oppp:=Doubleint(integrand(pool),r=R*cos(alpha)/cos(theta)..R,theta=-alpha..alpha);
alpha R
/ /
| |
oppp := | | | r | dr dtheta
| |
/ /