why does combine(sin(x)^2) expands the expression?...

This is just a question on terminology. The name "combine" implies pulling terms together. Yet, when applied to something like sin(x)^2 it has the effect of expanding it:

r:=sin(x)^2;
combine(r);

Which seems counter-intutive to me. I tried first expand(r) but that did not expand it.

Fyi, in Mathematica the function to do the above is called

Sin[x]^2;
TrigReduce[%]

1/2 (1 - Cos[2 x])

As Mathematica does not have a Combine[] function.

So, I am just wondering about the naming, that is all. I would never have thought first that a command called combine() will expand sin(x)^2.

how to make S transfer function to Z transfer func...

Hi, all

I want to get some formular by the maple. I have some S domain transfer function, want to transform to the Z domain, but I don't know the way to realize it, is there any library function like "c2d" as in the Matlab? but "c2d" can not deal with the expression.

Thanks for replay to me!!!

How do I launch the clickable math interface in ma...

New user. How do I launch the clickable math interface as in the demo video in maple 17 student? I also need help with entering/ solving simultaneous equations step by step.

I need to review probability...

Hi,

I'm preparing for GRE and i came across this question from 800score.com while reviewing concepts for probability.

`In a deck of 52 standard playing cards, what is the probability that pulling a single card from the deck `
`will produce a black card?`

`http://www.800score.com/content/gre/guidec7dview1a.html`

`Please...`

bracket matching rectangular yellow box not appear...

I have bracket matching turned on but donot get the rectangular yellow box around matching brackets as shown in the attached picture. Can anyone help me how to turn this feature on for both input and output?

How to solve an equation in three variables, in te...

I have the following equation, I want to solve it for b keeping a and c fixed.

5*b^5+(60-5a)*b^4+(125+50c-80a)*b^3+(594c-445a-775)*b^2+(2324c-1005a-3270)*b+3000c-750a-3000=0.

How to solve it in maple?

Trying to plot an equation in Maple, Plotting Erro...

I am using Maple 15 and every time I try to plot this equation it doesnt seem to want to plot. This is the code I keep trying to input:

plot(3*e^(-x)*x-e^(-x)-1.5*e^(-x)*(x^2)+e^(-x)*(x^2)*log(x),x=0..9,y=-1..0.6);

Every time I get "Plotting Error, empty plot"

The equation came from the original differential equation .5(d^2y/dx^2)+(dy/dx)+.5y(x)=ln(x)e^(-x)

Also When i try to plot this equation:

-.5*e^(-10*x)*sin(10*x)-.5*e^(-10*x)*cos(10*x)+(3/2)=300

How to integrate exponential integrals in Maple? (...

Hello,

I've been trying to force maple to find a solution of this differential equation:

ode := -((D@@2)(y))(r)-2*y(r)/r+y(r) = (2-V(r))*u[0](r)

dsolve(ode, y(r));

gives

`y(r) = r exp(-r) _C2 + (exp(r) + 2 exp(-r) Ei(1, -2 r) r) _C1 - 4             /  /  /             |1 | |    exp(-3 r) |- | |              |2 | |              \  \/                                  /   2    \             \         `

How do you create banked curves in MAPLE?...

For a math class, we have to create a roller coaster. Part of the coaster consists of two banked curves. I've tried looking it up but Maple isn't very clear on how to create the. So, how do you create banked curves in Maple?

Fouriest transform of Integers

by: Maple 16

Today's SMBC strip by Zach Weinersmith is a silly math joke but it was pretty much begging for implementation.

So, here is a simple brute force Maple program to compute the Fouriest transform of an integer.

```fouriest := proc(n::posint, ob::posint:=10)
local b,f,cap,i,rdx,fc;
...```

Polar plots for two differential equations...

Hi,

I have two differential equations describing a solar sail in 2D.

One is my radial direction and one is the tangential direction.

I have plotted r(t) and theta(t) but I want r(theta) so I have assigned my two differential equations and initial conditions, have my two plots for r and theta in terms of t and then I have used the following command to plot in polar coordinates:

Hi,

I'm new in Maple and i've a project to do. I've to find at what time is 90% of the steady-state concentration of C achieved. And the eq is

z'=k(1/2-z)(1/3-z), where k=0.3.

So i had worked in Mathematica before and i know that it would look something like that in there:

eqn1 = 0 == k (1/2 - z[t]) (1/3 - z[t])

DSolve[Evaluate[{eqn1}], z[t]].

But i have no idea how to find this 90%. I hope that someone will...

Shifted Data IVP...

Hello everybody,

I just realised Maple is allowed for my upcoming exam after New Year.

My plan is to have templates of the most common math problems, I might encounter for quick solutions.

Anyway, I have run into a problem with Laplace shifted data, particularly initial value problems. I have been searching for HOURS, and feel like I have look up everything on google, maplesoft and other sites without succes.

I hope some of you are able to help me. The exercise is:

how to stop maple from evaluating my solution and ...

Hello,

I am working on a Maple project and it require me to pass a differential equation in a specific order like

x'=y &amp; y'=x^2.(It is differentaiting w.r.t 't'(say))

However when I convert the equation into string it converts something as

diff(x(t),t)=y(t) & diff(y(t),t)=x(t)^2

Is there any way to stop maple from evaluating into maple/math format?

Is there any way to pass an equation without changing it's existing form?...