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Don't be mistaken, i'm not saying that you gotta work fast and take 'shortcuts' to have a plethora of time in 2U. I finished the 2008 in like 1.5 hrs. The rest i used for checking etc. I always set it out as such: u= , v= u'= , v'= y'=vu'+uv' OR/ y'=vu'-uv'/(v^2)

dude, you've already answered your own Q. Marking Guide Line:-2 marks for correct answer. The HSC markers don't give a shit if you use u' v' system or just go straight ahead and find dy/dx.

As t---> infinity, P--->1000

no probs, did i do a good enough job of explaining it? if you want explanation on any other Q just post in this thread

haha, you said what we were all thinking. It's Spot the Aussie.

The little 'c' is radians notation. 1 radian=180 degrees.

Im assuming the Q says : "Simplify". cotx-cotx(cos^2x) cotx(1-cos^2x) [factorisation, cotx is common in both terms] From the unit circle we know that sin^2x+cos^2x=1 so we can rearrange this like so: 1-cos^2x=sin^2x, now we can sub this in for the bracketed part cotx(sin^2x) now...

Think about it dude, if you got a negative gradient then its sloping downwards from left to right. If you found this angle (@) to be 59 degrees. Then the value w.r.t the positive x axis would be 180-@ ( Angle of a Straight Line, Coordinate Geometry Rule) So Angle =180-@...

hey joel, yer thats all correct man. It follows the pattern n(n+1) [similarly n^2+n]

Pattern of n^2+n

ahh right, i heard that they realised asians were dominating it so they added verbs to help people who have english as a first language, when i think bout that explanation though i realise its unlikely/

b) You guys are just doing this right: e^ix=cosx+isinx for any real number x e^i(pi)=cos(pi)+isin(pi) Since cos (pi)=-1, sin(pi)=0 e^i(pi)=-1 e^i(pi)+1=0

That's pretty cool. Heres one: (x^2)+(5y/4-sqrt|x|)^2=1 ( or just graphamatica it)

Thanks alot buchanan. I'm going to attend the Melbourne ones.

No offense or anything, you are only one of many many people that have a completely wrong view of HSC physics. HSC physics has become more of an english based subject than mathematical. Any maths that is still included within the current scope is substition into formulas (90% of which are given)...

The binomial distrubution formula is P(X=R)=nCr p^k q^n-k where p is the successful attempts and q= is the unsuccessful ( ie.1-p). So as you can see nCr is inclusive. -But the reason behind the nCr is that the successful attempts could occur at anytime throughout the 7 tosses. There is no order.

i thought this went without saying lol read between the lines

or any of your classes treb, those people are insanely smart (yourself inclusive)

lol yer, that's what i also said. Such a Tool though

Fuck i hate Rudd. Btw, the expression is actually "fair suck of the sauce bottle"..hes just a spastic that's all