# Search results

Hi
2. ### First Year Mathematics B (Integration, Series, Discrete Maths & Modelling)

Re: MATH1231/1241/1251 SOS Thread make dy/dx the subject and you'll see. substitution y(x)=x.v(x)
3. ### UNSW 2016S1 Results Thread

Nice nice! Actual goals
4. ### dividing into equal groups

"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.
5. ### UNSW 2016S1 Results Thread

I'm over the moon then :) :) Is there any chance that it would change?
6. ### UNSW 2016S1 Results Thread

I'm doing fins1613, acct1501, math1151, econ1101. My decimal point is .5
7. ### UNSW 2016S1 Results Thread

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
8. ### UNSW chit chat thread

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
9. ### Ma...tri...ces..

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?
10. ### UNSW chit chat thread

Re: UNSW chit chat thread 2016 Does anyone know if the provisional timetables usually deviate much from the final exam timetable?
11. ### Mean Value Theorem proofs

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)<...
12. ### Mean Value Theorem proofs

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}
13. ### Laters' Maths Help Thread

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]...
14. ### Laters' Maths Help Thread

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...
15. ### Laters' Maths Help Thread

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.
16. ### leehuan's All-Levels-Of-Maths SOS thread

You must be doing math1151 too?? haha I got stuck on this for a bit too. I just used a GP summation 1+x+x^2+x^3+x^4=\frac{x^5-1}{x-1} since we're not considering this when x=1. then the top is negative, and so is the bottom! so when you divide it it's positive. Of course it would work for...
17. ### ngo and sons entrance exam failed

lmao then you're definitely getting in. the centre only distributes the test to find a class that best suits your learning pace/ability. they take all kids regardless of ability although sometimes they will tell you that 3u isn't for you. in the past they've recommended other centres for 2u but...
18. ### math1151 course pack

Thanks for your input guys. I just ended up buying the 2016 pack just in case. :)
19. ### math1151 course pack

Hey guys, Do any of the actl kids on here know if the 2015/2016 packs will be different? i.e. if they do will they affect me in any way? Someone wants to sell me their pack for cheap. But idk if it's worth the RISK. Should I just buy the 2016 one?
20. ### UNSW rollcall 2016

First year actuarial/commerce :)