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http://www.boredofstudies.org/community/showthread.php?s=&threadid=30743&perpage=15&pagenumber=1

yes its wrong..ill attempt it agian to pick any three letters there are 9p3 ways let the a's be a1,a2,a3 so if there are 3 a's it would be a1,a2,a3 ..there are 6 ways of arranging these that the 9p3 took in account but we only ned one hence (-5) from 9p3 next, if a1,a2 or a3 are...

:( ..you got to check your exam in the test???..atm i cant even finish it in 3hrs ..i get about half way through 8 in general..ie the most recent test.. i battled through 8a OK...got to b with 5 mins to go and was like WTF..(2002) ..the qn ended up taking me 30 mins afterwards..and like...

yes keypad thats wha t i was thinking

as long as i get 99.3 i dont give a shit..well band6's is the scicens / maths so if i get into aero at syd i may do the adv cources if i want

they need to intoduce a extension physisc / extension chemistry...1u each cources!!!!!!!! (also keep englsih adv compulsery but make it so it doesnt compulsery count!)

its not worth it to do anything like that to a math teacher...who do you think marks ur assessments? neway i have a friend who did 4u by correspondance and got 98 in 4u maths last year..dont blame the teacher or the books..., blame urself

in the example you gave you would assume gravity is the only force then possibly assume it..if you have time show range = ......and it follows sin2@=pi/2 is a max...@ = pi/4

the optimal angle in EVERY case is not 45%...even on the earth, the angle is slightly less due to air resistance..but in one example i did earlier this yr (cant even remember the qn) the optimal angle worked out to be 38 degrees..i dont think that was 3u tho...maybe 4u?

> 70 in english :(

yeah..as long as you get into you r desired uni course, the rest doesnt matter

edit: ah ok..yes looking at the book i didnt mean that one :) thx

if ur burnt out / tired..go to gym/exercise!!

i guess if u practive u just see it :(..

e^-x = 1/e^x so e^-x / (1 + e^2x) = 1 / (e^x(1+e^2x)) you can now do partial fractions(have you done this yet? ..but in general when the numerators a low number1,2 etc/ or works out nicely its bettter / easier to just observe (saves time in exams!)

not with simple ones like that...just sorta look at it and see waht it equals ie e-x ------- 1 + e2x = 1/e^x - e^x/(1+e^2x) which is easy to intergrate

notice it equals 1/e^x - e^x/(1+e^2x)

5. If a, b, c, d, e and f are six positive real numbers, such that a2 + b2 + c2 = 16 d2 + e2 + f2 = 49 ad + be + cf = 28 show that (a + b + c) / (d + e + f) = 4 / 7 [Hint available] if you havent done the last one...(did this thismorning on the trian..sad i know) heres hint.. ie...

= int 1/[e^x(1+e^x)] = int 1/e^x - int(1/(1+e^x)) which is ezy

personally..i agree with what u say lobster..but alot of ppl dont want to go to uni and hence their 'learning' will be what they learn in the HSC (or lack thereof :P)