I wonder to evaluate divergence theorem when f:xi+yj+zk and the surface is a sphere with equation x^2+y^2+z^2=9 when there is a hole in the sphere with equation x^2+(y-1.5)^2+z^2=1

the volume that we consider is space between inner sphere and outer sphere

thanks 

Question 1:

Animate the plot of the graph x^2 + Bxy + 4y^2 = 2010 letting the parameter B range from -10 to 10 using frames 100. Determine when family of curves is 2 straight line.

Question 2: 

Animate the plot of the graph z^2 + c = x^2 + y^2 letting the parameter C range from -10 to 10 using frames. How can I graph and Describe what is happening

Student's t distribution is named after William Sealy Gosset's pseudonym, Student. He published using this pseudonym because his employer, the Guinness brewery in Ireland, did not allow its employees to publish scientific papers after an incident where trade secrets were disclosed. In this blog...

The Canadian Lotto649 draws are randomized the old fashioned way, the draws are held using a Ryo-Catteau Tulipe ball machine made by a well respected French Company. The draws are video recorded in a secure studio, and broadcast live.  There is no reason to suspect that these draws might not be random, but let us look at some ways we might detect it if it were not random.

You could look at the Lottery draws as a generator for a binary sequence as I did in my previous post, but as Robert Israel pointed out in the comments, that encoding can hide some non-random behavior (e.g. if the number 25 appeared in every draw, that encoding would not appear less random).

I setup Maple 11 on windows 7   but the program does not save any data

Read and write English  is a strian!

Im trying to resolve a simple system of 2 ecuations and 2 incognits, but I dont know why maple return the same that I put in the instruction as the answer, I will put my procedure here:

theta[2]:=20;
theta[3]:=theta[4]-30;

Maple returns:
                              ...

    My first touch with Maple was in 1997,when I was in my undergraduate course.The software of maple was in three floppy disk.

    Since 2000,I becomes a teacher for mathematics .Now I am using it to compute the integrate,limits,etc.

To the world you may be one person,but to one person you may be the world!

Dears, How can i plot a parametric equations for an ellipse

x[i]=a*sin(t[i]),     y[i]=b*cos(t[i])      t[i] takes a numerical vaulues from - Pi to Pi.

i.e

i want to plot the values ,

(x[1], y[1]),

(x[2], y[2]),

.

.

(x[i], y[i])      where     i=1..100,

Dr. Amr

Dears. I want to evaluate the following expression numerically

G[i]=sum(Gama[i,k], k=1..100, k<>i),

where

Gama=((x[k]-x[i])*xdot[k]+(y[k]-y[i])*ydot[k])*dtheta[i]/((x[k]-x[i])^2+(y[k]-y[i])^2)^2

Dr. Amr

Hi,

I am trying to force the conversion of

to its cleaner looking

Anybody know how to do this in a straight-forward way? I've tried convert...

Hi,

When I solve this equation

Y(lambda):=_C1*sin(lambda*L);

solve(Y(lambda)=0,lambda);

Where _C1 and L are constants, I get 0.

But the solution of this equation which is easy is lambda=n*Pi/L where n=1,2,3,...

Why?

Thanks

I tried to build Pascal's triangle with powcrate as bellow described. It seem not worked and I don't know why (I am using Maple 12). Could you please help me. Thks a lot

Try to build Pascal's triangle with powcreate

Try with 2 different ways:

with u(n)  use subsop and zip to handle the list

with v(n)  use op and zip to handle the list

> restart;
> with(powseries);
 [compose, evalpow, inverse, multconst, multiply, negative, powadd, powcos, ...