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complex is hard for me I mean it can be hard but HSC exam doesnt usually give you the hard ones

u can use all of symbols u mentioned there

do a google search or other search engines for that matter killerinfo.com and dogpile.com maybe?

thats true, but I feel I NEED to say that you do NOT need to do that verification thing alpha satisfies x+1/x = 5 since it's a root that's all you need. and that's why its put as part(i) if you need that verification then you'll be asked alpha+beta first before alpha+1/alpha

oh, I meant its good to see a different approach not to criticise or to say that mine is more normal

well u used a different approach for the inequality uh that BIG picture is really annoying!! and it doesnt answer any question. EDIT: the picture is not replaced by links

dont think so :p (about the 4U thing)

Q4(c)(iii): x=acos(nt+@) v=-ansin(nt+@) put "t=0 and x=1" and "t=0 and v=4" into the two expressions and you know the quadrant of @ Q6(iii) 1/(n+1) < [lnx]_nⁿ⁺¹ < 1/n 1/(n+1) < ln([n+1]/n) < 1/n Noting that [n+1]/n = 1 + 1/n, and considering the two inequalities...

well assuming u can quote x=asin(nt+@) or x=acos(nt+@), just choose one of them, say x=asin(nt+@) but since x dot dot = -4x = -n²x, n=2 x=asin(2t+@) x dot or v=2acos(2t+@) then put t=0 to both, you get 3=asin@ --(1) -6root3=2acos@ --(2) Square equation 1 then square...

yes, sleep.

To clear up the confusion: x + 1/x = 5 has roots a and b (i) a + 1/a = 5, since a satisfies the equation x + 1/x = 5. (ii) We can re-write the equation as x² + 1 = 5x x² - 5x + 1 = 0 because it will still have the same roots or solutions as x + 1/x = 5...

can be both. checked it with a dictionary.

hmm probably you can be a postman? ;) jk... I think 40 is a bit too low...

grr I was too late!!

well I did a very quick inspection and found it: http://www.boredofstudies.org/community/showthread.php?t=41677 (ignore those inspection stuff.. they're just having fun!)

do a search on this forum theres this exact question before...

I'll just give you 3 extra coins coin1 coin2 coin3 done ;)

oh theres a very obvious flaw in that statement if you relate that to your previous post. If you were the postman, you would know whether the medal is already in the mail or not because you're delivering it yourself. Therefore, by proof of contradiction, you're not the postman.

Resources section, by OLDMAN its called an analysis of the 2002 paper

Hmm.. do you need to give colour of the precipitate? I just wrote "forms precipitates" in the Observations column LOL except for the third one where I was sure it was white.