Recent content by laters

Hi

Re: MATH1231/1241/1251 SOS Thread make dy/dx the subject and you'll see. substitution y(x)=x.v(x)

Nice nice! Actual goals

"How many ways can 21 people be divided into 3 equal groups?" Just wondering if the answer should be 21C7 14C7 7C7 or same but divided by 3!, seeing as I don't know if the groups are implied to be 'distinct' or not.

I'm over the moon then :) :) Is there any chance that it would change?

I'm doing fins1613, acct1501, math1151, econ1101. My decimal point is .5

Is it possible that some student results are entered later than others for the same subject? Because mine is a lot of points (like almost 10) over what I'm expecting lol

Re: UNSW chit chat thread 2016 can anyone who's done actl1101 confirm lectures are definitely recorded? would I be missing much just watching them from home

If AB=BA (A, B square) does that necessitate that AB=BA=I? As in, if given AB=BA can I deduce that A and B are inverses?

Re: UNSW chit chat thread 2016 Does anyone know if the provisional timetables usually deviate much from the final exam timetable?

Thanks leehuan and Integrand!! I managed to get the arctan one out. However for the first one I asked, I just want some clarification. I know 23 < c < 27 so if c < 27 then I can obtain the lower bound. But obviously if I use c>23 then I would require a calculator to show that the 3-23^(1/3)<...

Can anyone prove \frac{4}{27}<3-23^{\frac{1}{3}}<\frac{3}{16} using the mean value theorem? I've been trying to come up with functions that I can apply the MVT to but I've gotten stuck. Also for \frac{8}{145}<\tan^{-1} \frac{9}{8}-\frac{\pi}{4}<\frac{1}{16}

Let f be continuous in \mathbb{R} with \lim_{x\rightarrow\infty}f(x)=\lim_{x\rightarrow-\infty}f(x)=0 Showthat if there is a number \xi such that f(\xi)>0 then f attains a maximum value in the reals. [Note the max min theorem applies to finite closed intervals [a,b] only]...

2) Suppose that for any K>2 the solution to f(x) > K is [tex]x\epsilon(1,\frac{K}{K-2})[\tex] What is the behaviour of f(x) as x approaches 1+? Carefully explain your answer This is mainly a problem with my working. So intuitively I know that the limit must be infinity. the reason being that...

Hey guys, I don't come on here often but I've seen similar threads so I've decided to make one too :) For your reference I am doing MATH1151 this sem. 1) Find \lim_{x\rightarrow\infty} \sin\frac{1}{x} . I already know it's 0 but they want a solution using the pinching theorem.