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• Today, 02:53
Thank you for pointing this out. I have not looked at other sites in a long time so don't know these things. If a merge was possible I promise I...
4 replies | 141 view(s)
• Today, 02:01
Hey firemath, Thank you for the reply. It's great to hear back from someone on this tough topic. I actually strongly prefer a merge over other...
4 replies | 141 view(s)
• Yesterday, 17:57
When I throw it at Octave online, I get: So it seems it is none of the above, but the answer $3$ is close. For reference, I have re-encoded...
1 replies | 54 view(s)
• Yesterday, 14:20
Let $f:\mathbb R\to \mathbb R$ be a twice-differentiable function such that $f(x)+f^{\prime\prime}(x)=-x|\sin(x)|f'(x)$ for $x\geq 0$. Assume that...
1 replies | 54 view(s)
• April 6th, 2020, 17:02
Prove It is not giving you the answer he is giving you a suggestion that you can use the limit he posted. See if there is any kind of substitution...
4 replies | 87 view(s)
• April 6th, 2020, 12:06
Hi all, I think even we do switch to XF (is still going to happen) the time has come to make a change. We have a database of amazing content here...
4 replies | 141 view(s)
• April 6th, 2020, 11:37
Hi all, I hope you are all safe, healthy, and not affected in a serious way by the world wide COVID-19 virus. Here in the US it has completely...
0 replies | 51 view(s)
• April 6th, 2020, 11:34
Hey mathmari!! This is an example where Newton-Raphson can have problems if we are not careful. If we pick a starting value that is too far from...
2 replies | 42 view(s)
• April 6th, 2020, 10:30
\frac{\left(x\sin\left(\pi\left(x-1\right)\right)\right)}{e^{x/9}(x-1)} The above graph shows that the function repeats its value at $x=1$ when $x$...
2 replies | 42 view(s)
• April 5th, 2020, 10:37
I substituted $n=\frac 1{x^2}$, which also means that $x^2=\frac 1 n$. So we get $\Big(1 + \frac 32 x^2\Big)^{1/x^2} = \Big(1 + \frac 32 \cdot \frac... 7 replies | 264 view(s) • April 5th, 2020, 09:14 It's like this: $$\Big(1-\frac 12 x^2 + \ldots\Big)\Big(1+\frac 12 (2x)^2 - \ldots\Big)\\ =1\cdot 1 -\frac 12 x^2 \cdot 1+1\cdot \frac 12 (2x)^2 -... 7 replies | 264 view(s) • April 5th, 2020, 07:04 The series expansion of \cos x = 1 - \frac 12x^2 + \ldots. And the expansion of \frac 1{1-x} = 1+x+x^2+\ldots So:$$\frac{\cos(x)}{\cos(2x)}... 7 replies | 264 view(s) • April 5th, 2020, 01:08 Here is this week's POTW: ----- Suppose that the positive integers$x, y$satisfy$2x^2+x=3y^2+y$. Show that$x-y, 2x+2y+1, 3x+3y+1$are all... 0 replies | 215 view(s) • April 5th, 2020, 01:02 No one answered last week's POTW.(Sadface) Below is a suggested solution: The given function is the square of the distance between a point of the... 1 replies | 173 view(s) • April 4th, 2020, 04:14 This is actually a proof of (ii)$\Rightarrow$(iii) in Lemma 3.2. So we are assuming that (ii) holds. In particular, since$\overline{ f(A) }$is... 1 replies | 226 view(s) • April 3rd, 2020, 15:47 I have obtained access to the full solutions manual, after contacting Wiley about it. I will not type up the solution in full, but simply note a few... 1 replies | 282 view(s) • April 2nd, 2020, 15:47 In the mid-1990's, an electrical engineer/computer scientist by the name of Judea Pearl started to change the world by greatly improving our... 0 replies | 245 view(s) • April 2nd, 2020, 12:25 Klaas van Aarsen replied to a thread f in Calculus It appears the answer is: dkm Acronym for "don't kill me". Often used when somebody says something that somebody else finds really funny,... 5 replies | 337 view(s) • April 2nd, 2020, 11:56 topsquark replied to a thread f in Calculus I believe the proper question is "What the 'f'?" -Dan 5 replies | 337 view(s) • April 1st, 2020, 15:04$\newcommand{\doop}{\operatorname{do}}$Problem: (This is from Study question 4.3.1 from Causal Inference in Statistics: A Primer, by Pearl,... 1 replies | 282 view(s) • April 1st, 2020, 06:35 Not quite, although you started correctly. The limit in this case is as$x\to\infty$, so you want to see what happens when$x$gets large. This means... 3 replies | 330 view(s) • March 31st, 2020, 17:53 topsquark replied to a thread [SOLVED] 299What is the acceleration in Calculus Wait! What do you mean by you changed it to v(t)? The particle's position is x(t) = sin(t) - cos(t) means that v = \dfrac{dx}{dt}. You can't just... 4 replies | 324 view(s) • March 31st, 2020, 14:52 Hi Goody, and welcome to MHB! To prove that \lim_{x\to\infty}\frac{x-1}{x+2} = 1, you have to show that, given$\varepsilon > 0$, you can find$N$... 3 replies | 330 view(s) • March 30th, 2020, 05:31 Let's take a look at a couple of examples. If$f(x)=x$, then$f'(x)=1$and$f''(x)=0$. So$\lim\limits_{x\to +\infty}f'(x)\ne 0\$, isn't it?...
21 replies | 499 view(s)
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### 211 Visitor Messages

1. Hey there Jameson

word problems always get me.

question:
A belt is driven by a pulley at 33m/s. The pulley rotates at 720r/min. calculate:
a. The rotational frequency
b. the diameter of the drive pulley
2. Thanks Jameson! I'd love to become a part of the community!
3. Hello and thank you!
I posted a question on freemathhelp dot com which I am finding challenging. I was going to post here as well but the site looks similar. I don't want to re-post if it is the same community. Should I proceed and repost the question here?
Thanks
4. Thanks Jameson!
5. I remember thanking a post by Mark on trigonometry about how to evaluate the cosine or sine of a certain angle with plans of revisiting it later. In going over my profile, I just realized that there is no tab that allow me to view that thanked "bookmark". Is this really the case?
6. Hi Jameson!

Thanks for the welcome! Much appreciated.

I do have a question actually: I would like to post a mathematical problem that I have encountered at work - a "real life" problem as such. Would this be the right forum to do so? And under which thread would you recommend I post it?

Thanks,
RdM
7. i do have a question about cantilever beam maximum deflection and graph making using derivatives.
8. Hi Jameson. I've got a question and I'm not sure which category it would be in it's quite the question
9. Thanks. I am an engineer with some rusty calculus skills and am struggling with an integral problem that I intend to post. I have never used Latex. Is there a way to preview my function somehow? I see the dialog that says it is previewing it but it looks the same way there.
10. Hello I would like to know if you can help me with a math problem. It is not allowing me to post it.
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#### April 1st, 2020

• 14:58 - Ackbach clicked Thanks for this post: -= Hidden Content =- by Jameson

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