Hello! Anybody can help my to have this problem?

A^2+3*A+Delta*I = 0;

I want calculate 'a' and 'b' whit 'x' and 'y', and it's my code:

++++++++++++++++

But this is wrong, but I dont know...

Thank you!!!!

(sorry for my English)

int(sqrt(1 + sec(x)^2), x)

int(sqrt(2 + tan(x)^2), x)

With Maple 13, which is the latest version on the computer on which I tested these integrals (that originated with a

senior scientist in Australia), the former yields a reasonably compact answer, but the latter yields an extensive

output containing Elliptic functions of various kinds.  The two integrands are trigonometric identities.  What is the

problem here?

    ...

how can i input and solve  the one dimensional wave equation with intial and boundry conditions???

      Here is one of the problems from "Mathematical Trivium"  (Russian Mathematical Surveys, 1991, 46:1, 271-278) by V. Arnold. Those problems are aimed at the strong graduate and postgraduate students of the top universities.
      I find it remarkable that a big part of the Arnold's problems can be solved with Maple.
 
      Problem...

this is really 2 questions- the second being my attempted rectification of the first.

I have expressions in t for a vector. This vector by construction is always (and meticulously verified!!!) of the form [1,0,0....] when t = 0. when i do solve({final[1] = 1},{t}), I never get any solutions. I don't get the 'solutions may be lost' warning either, why not??? 

I thought, as the vector components are quite complex that this may be due to computational accuracy so attempted

r := 1;
c := 1;
G := 1;
M := 1;
theta := 90;

ex1 := {
Diff(f1(t), t$2)
+ 2*(-G*M/(r*(-r*c^2+2*G*M)))*Diff(f(t), t1)*Diff(f2(t), t) = 0,

Diff(f2(t), t$2)
+ (-(-r*c^2+2*G*M)*G*M/(r^3*c^4))*Diff(f1(t), t)^2
+ (G*M/(r*(-r*c^2+2*G*M)))*Diff(f2(t), t$2)
+ ((-r*c^2+2*G*M)/c^2)*Diff(f3(t), t$2)
+ ((-r*c^2+2*G*M)*sin(theta)^2/c^2)*Diff(f4(t), t)^2 = 0,

Diff(f3(t), t$2)
+ (-sin(theta)*cos(theta))*Diff(f4(t), t)^2 = 0,

Diff(f3(t), t$2)

Hello!

I am working with very complicated PDE's, and I am stuck with the chain rule.

The variable k is dependent on T.

T is dependent on x and y.

The expression for k is quite complicated, and will change depending on the application.

So, we are trying to not include the expression for k in Maple, but only that k=k(T), and carry this information throught the calculations.  I do need to calculate the derivative and carry this information as well.

This happens every single time I try to do this and I need to resolve it once and for all.

I have a text file called be which is sitting on my desktop. It consists of two columns of data seperated by whitespace. How do I get maple to read this file? The help pages are of no use since it just tells me to do something like...

readdata(be,2): or readdata(be,1):

both of give the same "Error, (in readline) file or directory...

I am trying to plot a 3D function and as soon as I hit enter this error pops uo saying, "Error, (in plot3d) expected ranges but received equations x=-2..2 and y=2..-2"

Any help would be greatly appreciated.

Hi

I have a problem with Maple. I would like to see an answer in numbers this equation, but instead I get more equations. I've tried to use evalf but that didn't work for me.

Is there someone who can look at this and help me?

Thanks in advance!

This is my Maple output (sorry for the uglyness):

> SomAx := Ax+F2+F6*sin(beta)-F1*sin(gamma) = 0;
print(`output redirected...`); # input placeholder
    ...

I would like to know how to find an extreme (max) point of function of two variables:

and how to manage with this error

"Warning, solutions may have been lost

                                                  ...

I migrate to Mac OS X 10.6.6.

And Maple 13 and 12 (with or without Firewall)

do not work any more : "kernel connection is lost".

(When Firewall is working, it has all the necessary permissions.)

The mserver (64 bits) mobilize 100 % of CPU two or three times

(and I have to wait at least 1 minute each time), then disconnection appears.

I reinstalled Maple 13 and get the same results.

What can I do ?

Can I  upload a worksheet in MapleCloud with some security code that allow the person just read the worksheet and not download/save in their own computer? Is there a option in MapleCloud like this or any worksheet in MapleCloud can be viewed and save?

Thanks Washington Inácio

Can someone kindly write me some code to unscramble a jumbled word into english.

eg: input: "atc"; output: "cat",'act".

it will need to invoke the inbuilt dictionary.

thx

Test.mw

If I use a binary {0,1} linear program the cardinal constraint ie control the
number of 1's (long positions in portfolio) works beautiful. See attached worksheet.

The problem starts when I convert the problem into a constrained integer {-1,0,1}
linear problem where -1= short position, 0=no position and 1=long position.

In the first example when we add the constraint  add(w[i], i = 1 .. NC) = 4