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Common math questions, quality answers.
Jul24-14 10:02 AM Greg Bernhardt 
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Test your skills. Math challenges will be posted at least once a week. Suggestions for problems are welcomed. Brought to you by Office_Shredder.
Jul26-14 11:48 AM jostpuur 
Meta Thread / Thread Starter Last Post Replies Views
Jan16-12 Greg Bernhardt
Please post any and all homework or other textbook-style problems in one of the Homework & Coursework Questions...
Feb23-13 09:23 AM
micromass
1 37,935
can someone please simplify? \sin \frac{\pi}{n} \sin \frac{2\pi}{n} ... \sin \frac{(n-1)\pi}{n}
Jul15-07 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...
Jul15-07 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...
Jul15-07 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....
Jul15-07 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: ...
Jul14-07 10:37 PM
mathman
4 2,201
In an 8-gram solution of water and alcohol, the ratio by mass of water to alcohol is 3 to 1. If 12 grams of a solution...
Jul14-07 08:18 PM
lLovePhysics
6 2,072
What is pi? ( 1 2 3 ... Last)
Hi all In almost all the formulae related with symmetry, we use pi. For example, in case of circle, we use pi, and in...
Jul12-07 06:33 PM
Integral
64 6,685
Hallo I am trying to solve for x the equation (b-x)exp^+c-x=0 where a,b and c are constants. Could...
Jul12-07 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...
Jul12-07 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...
Jul12-07 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 ?
Jul12-07 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...
Jul10-07 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 ...
Jul10-07 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...
Jul10-07 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...
Jul10-07 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 non-integer, what form would the...
Jul10-07 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...
Jul9-07 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...
Jul9-07 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...
Jul9-07 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...
Jul9-07 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...
Jul9-07 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...
Jul8-07 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
Jul8-07 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...
Jul8-07 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...
Jul6-07 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...
Jul6-07 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...
Jul6-07 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...
Jul5-07 10:41 PM
ktoz
2 943
quick question: how does this work- (root)72 = 6(root)2 and what is this technique called?
Jul5-07 06:15 PM
Kurdt
2 944
a^(1/(2)^1/2)) that is a raised to the power 1/underroot(2)
Jul5-07 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...
Jul4-07 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...
Jul4-07 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 ...
Jul4-07 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...
Jul3-07 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:...
Jul3-07 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...
Jul3-07 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...
Jul2-07 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...
Jul2-07 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...
Jul2-07 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...
Jul2-07 06:29 AM
morson
7 1,472

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