
Please post any and all homework or other textbookstyle problems in one of the Homework & Coursework Questions...

Feb2313 09:23 AM
micromass

1 
37,935 
can someone please simplify?
\sin \frac{\pi}{n} \sin \frac{2\pi}{n} ... \sin \frac{(n1)\pi}{n}

Jul1507 08:22 PM
Kummer

2 
1,346 
Is there such a thing?
The factorial is usually defined as
n! = \prod_{k=1}^n k if k is a natural number greater...

Jul1507 07:57 PM
ZioX

6 
14,124 
Hi! Who knows:
can any cubic root like \sqrt{x} with x real be written as a form in which only square roots (real or...

Jul1507 04:23 PM
edgo

10 
4,636 
I'm have a hard time with graphs equal to zero like these:
A. x^{2}+y^{2}4x+2y+5=0
B. xy=0
C....

Jul1507 10:19 AM
CompuChip

6 
1,550 
I'm asked to define recursively (definition by induction) \prod_{k=1}^{n}a_k
Well, I wrote down the following:
...

Jul1407 10:37 PM
mathman

4 
2,201 
In an 8gram solution of water and alcohol, the ratio by mass of water to alcohol is 3 to 1. If 12 grams of a solution...

Jul1407 08:18 PM
lLovePhysics

6 
2,072 
Hi all
In almost all the formulae related with symmetry, we use pi. For example, in case of circle, we use pi, and in...

Jul1207 06:33 PM
Integral

64 
6,685 
Hallo
I am trying to solve for x the equation
(bx)exp^+cx=0
where a,b and c are constants.
Could...

Jul1207 05:23 PM
rgr208

6 
2,352 
if given two points each with different x and y coordinates, what is the best way to define the error between these...

Jul1207 01:24 PM
matt grime

4 
980 
hi everyone..i need help in solving this equation..x=(a*b+c)/mod
now what if the value of c is missing,i.e. you are...

Jul1207 04:35 AM
HallsofIvy

1 
1,032 
Between a finite amount of x and in infinite amount of x, is there an infinite amount of x ?

Jul1207 04:31 AM
HallsofIvy

13 
1,258 
I can't understand the different conditions given and from that equation of the circle is found.For example.
How...

Jul1007 11:08 PM
Werg22

7 
5,888 
This one has me stumped.
e^{\pi i} = 1
e^{2 \pi i} = (1) ^ 2 = 1
ln(e^{2 \pi i}) = ln(1) = 0
2 \pi i = 0
...

Jul1007 07:53 PM
mathwonk

5 
2,866 
I've found this flash speed math trainer.
http://www.jimmyr.com/blog/Speed_Math_Trainer_Program_126_2006.php
I was...

Jul1007 10:48 AM
Clodomir

0 
2,736 
I'm trying to get a numerical approximation for a complicated sum, and I'm currently trying to estimate the size of...

Jul1007 10:44 AM
CRGreathouse

0 
1,070 
I was wondering, if you have the function:
f(x)=A/B
and the value returned is a noninteger, what form would the...

Jul1007 05:57 AM
matt grime

12 
1,315 
I've stumbled upon what might be a geometrical interpretation of Taylor's series for sine and cosine. Instead of...

Jul907 10:30 PM
robphy

2 
2,683 
I came across something from the higher classes of math and I tried to prove it:
What do you call this kind of...

Jul907 04:43 PM
okunyg

8 
1,797 
Greetings,
I'm curious if "magic squares" have been found to be useful in mathematical or scientific endeavors...

Jul907 07:45 AM
HallsofIvy

3 
2,628 
Greetings,
I suppose all of us have at one time or another been fascinated by "magic squares"
My question is: has...

Jul907 06:45 AM
Qaiser Raza

8 
3,114 
"The arrangement of numbers with n rows and n columns to be a true magic square is that it contains all the integers...

Jul907 06:38 AM
Qaiser Raza

9 
2,611 
Lets say i have two sets of numbers (dealing with real numbers only):
\{ x \in R x \ge 0\}
\{ x \in R 3...

Jul807 10:19 PM
danago

3 
3,038 
can somebody prove that for all a,b,c>0:
a/(b+c) + b/(a+c) + c/(a+b) >= 3/2

Jul807 05:00 PM
morphism

1 
1,431 
Hi I have some problems with really basic equations (really elementary)
Let's say in order to solve an equation...

Jul807 02:44 AM
truewt

2 
1,825 
I think this belongs here, because it's not specifically differential geometry (well, that's an assumption, I don't...

Jul607 11:11 AM
Yersinia Pestis

0 
1,030 
I'm planning on taking a limits and infinite series course soon and was wondering what book(s) I could get off Amazon...

Jul607 08:40 AM
Edgardo

6 
1,963 
W*C^(Z/A) = X*C^(Y/A)  D*X + D*W
How do you go about solving for A?
Known: C>1
Also, if it makes it easier (it...

Jul607 08:34 AM
davee123

2 
1,474 
Back in the fractal craze, I wrote a simple application to generate the Mandelbrot set, and after way too many wasted...

Jul507 10:41 PM
ktoz

2 
943 
quick question:
how does this work (root)72 = 6(root)2
and what is this technique called?

Jul507 06:15 PM
Kurdt

2 
944 
a^(1/(2)^1/2))
that is a raised to the power 1/underroot(2)

Jul507 05:06 AM
HallsofIvy

2 
1,278 
Followup:
Suppose we have 2^9 ways of choosing topics on a pizza. Then, if we want different topics on 3 pizzas, we...

Jul407 09:30 PM
sk381

2 
917 
Hi, I am interested in knowing what the names of the english math books are for the school you begin on when you are...

Jul407 05:21 PM
disregardthat

15 
4,322 
My friend says that : If there are 9 different toppings then the number of ways to choose toppings for one pizza is ...

Jul407 05:21 PM
Werg22

4 
1,114 
hi
i'm confused at to how my textbook has done the following cancelling :S. hope you can clear things up for me :D...

Jul307 01:30 PM
Trail_Builder

2 
1,191 
cos(2x)=2cos^2(x)1
what algebrical rule guarantees me thet is right to divide both angles for 2:...

Jul307 11:46 AM
uart

1 
1,849 
when there is enough block ... here is my problem.
a hyperbola having F(5,0) and D(5,0) and difference of focal...

Jul307 11:44 AM
threetheoreom

2 
1,246 
Newby here.
Can someone summarize Godel's Theorems for me?
I'm not very knowledgeable on such things, but would...

Jul207 05:06 PM
matt grime

8 
1,761 
Just want a check of this please:
We have a complex equation of the form az+bz*+c=0
where a, b and z are complex...

Jul207 10:49 AM
loonychune

3 
2,487 
i just cant figure this out.
given a n x n matrix (with n>1) "A" such that all entries are integers and A is...

Jul207 09:43 AM
Kummer

4 
2,247 
How important is it to you to understand the math your applying? I am decent at math when it comes to remembering...

Jul207 06:29 AM
morson

7 
1,472 