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Yeah, thanks :) I was lookin at my other notes and i thought it was the 'angle between 2 curves' formula, so it confused me.... they look the same! :(

Oh I remember now, Thanks peoples

Ah thats the same as the solutions in the book. Whats this compound angle thing?

This question comes from the 1991 3u HSC paper Q 7)b) The solutions that came with this past paper book didnt really make sense for part (iii) So can anyone else use another method to solve (iii) ? Thanks http://img135.imageshack.us/img135/1410/trig3ch.gif

Oh i meant study guides, not past HSC papers. So it looks like excel's the best?

Which study guide do u people recommend? I heard Excel was good, but was wondering what ur peoples' opinions are

which do u reckon will help u memorise the notes? typing or writing them?

wow..... i need related text too....... any suggestions people?

Sorry... not following.... :(

thanks again! :) whats the graphical method? (as u can see i dont like differentiating -.- ) Oh and whats this? y=x^2/(x^2-9) = (x^2-9)/(x^2-9) + 9/(x^2-9) = 1 + 9/(x^2-9)

argh i cant do this one either.. find pts of infl. y= x2/(x2-9)

thanks, It was the first case ;) one question though.. how did u get from this line: y'' = -2(x2-16)-2 + 8x2 (x2-16)-3 = 0 to this: Thus, -2(x2-16) + 4x2 = 0

find any pts of inflexion on the curve y=1 / x2-16 i get this weird answer..... wot do you people get?

ah.. thanks alot guys :D yeah.. nice and fast replies!

Hi again.. stuck on this Q..... totally lost

Ahh i see where i went wrong.. thanks guys

Ok im stuck on differentiating and finding x when A'=0 ... A = x√2500-x2 A' = ?? ..... I'm using product rule and stuck on.. x = 2500-x2 Could u guys solve it and tell me where i went wrong? thanks.

Ahh thanks alot. The differentiating in part B is the one that confused me.. i hate differentiating with square roots

This question has got me stuck.. I've done part a) but stuck on b) Would be great if you guys could help and show me how you did it! Thanks! [answer is 6.25m^2] edit: oh crap... this is a 2u question, not 3u. Can a mod move it if its necesary?