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was that from fitzpatrick?? i think i've done it before.

lol. :) ok, i see now. and if you had, for example d/dx |x² - 1|: there'd be two solutions?? 1. -2x 2. 2x ??

Just on that, how do you restrict the domain without drawing the function first? Can you test for f'(x)>0 and/or f'(x)<0?? The basic inverse trig. functions are fairly simply to sketch. It's some of the other ones that I find more difficult to get my head around: E.g...

Easy? Average? Hard? So far, I'm finding inverse functions are giving me a little bit of trouble. Mainly the sketching of inverse trig. functions and finding the domain of some of them. Anyone got any tips for "inverse functions"? I could do with a few pointers.

yep, exactly right. ex 26(c) - can't remember the question though. anyone else also doing this exercise at the moment?

where are cm_tutor and affinity when u need them??? :) 1. pet hate is perms & combs. lol - however, i kind if like the challenge and getting the answer out in the end. i just hope somebody can solve this one, coz it's pretty interesting and i'd really like to know the answer. *i'm still...

that was what i was thinking as well..... so i just left the last two spaces for the women.

What's d/dx of |x|? The question: f(x) = sin^-12|x| Find f'(x). ???

hhhmm..... still confused. *why does the answer give a no. of arrangements <1?* it doesn't make sense. so how do u take into consideration that the two women sitting next to each other can be sitting in any position? is my working OK apart from that fact?

I came across this question in Cambridge 3U Maths Yr 12 - it was the first question of the "Extension" section of one of the exercises. Q: A group of n men and n+1 women sit around a circular table. How many arrangements are possible if no two men are to sit next to one another? A...

This might sound stupid, but what does "equating coefficients" actually mean? I came across it with the auxiliary angle method.

i have to agree with heinz. it's an easy 3 marks? so why not do it? use: cos2x = 1 - 2sin²x then rearrange that to get sin²x = ???

lol.....just realised heinz already it. :)

i did it on paper.....and i got an answer of pi²/4 which is approx. equal to 2.467u³ can somebody verify my answer?

i've often done questions asking for approximations for volumes using simson's or trapezoidal. all u have to do is approximate the integral using simpson's and multiply it by pi and then that's ur approximate for the volume. i think they do it in maths in focus in the challenge exercises.

hhhmmm. so i'm guessing u complete the whole 2U course before u go onto 3U??? if that's the case, then no wonder u have already finished? - - - - - - - - - - - - - - just on that: do you guys do 2U then 3U, or do you go topic by topic e.g. 2U physical apps + 3U physical apps in one go, or do...

i wouldn't go so far as obsession..... but i'd just like to know.....maybe it's just the pressure from having hsc maths this year working on my subconscious - telling me to persist with my quest to find out what other people's papers are like. :)

do u reckon u could type out: 1. the easiest question (IYO) 2. the hardest question how would u compare ur exam with the question i posted?

any chance of posting the paper so's i can have a look at the difficulty??

the Q4 that i posted (parts a and b) were worth 12 marks altogether. exam totalled to 50 marks. and we had 60 minutes to do it in. surprisingly though, the 2 guys who got 49/50 for 3U last year in the HSC (now doing 4U and repeating 3U), got 44/50 and 46/50 for that exam (i think - might have...