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I think whatever you do should be fine as long as you label it/provide a key for it. I usually use dotted lines

Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread yeah, second part should be fine once the first part is proved but first part i just cant get

Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread I have tried the method you suggested and all other methods I can think of at least twice and I still can't get it - could you please show your working if you have time? I get Q (-2(p+(2/p)), (p+(2/p))^2), is that right?

Re: HSC 2016 2U Marathon well i checked my working and i can't find anything wrong - its probably because you have z^3/x^3 as your last term where as i have y^3/x^3

Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread why are my questions getting ignored ;_;

Re: HSC 2016 2U Marathon Ceebs posting full working this late, hopefully this is right: $Let$\quad a=\frac { x }{ y } ,\quad b=\frac { y }{ z } ,\quad c=\frac { z }{ x } \\ $Using\quad identity$\quad { a }^{ 3 }+{ b }^{ 3 }+{ c }^{ 3 }={ (a+b+c) }^{ 3 }+3(a+b+c)(ab+ac+bc)-3abc,\\ \frac { { x...

My teacher said B is wrong because the astronaut and spacecraft aren't orbiting the sun; they're orbiting the Earth (read the question again)

Re: HSC 2016 2U Marathon A good challenge question: A parallelogram is inscribed within a triangle so that they have one vertex in common. The other vertices lie along the sides of the triangle. Prove that the maximum area of the parallelogram is half that of the triangle.

Re: HSC 2016 2U Marathon R=h\tan { x } \\ With\quad pythagoras\quad in\quad the\quad smaller\quad triangle,\\ { r }^{ 2 }={ R }^{ 2 }+{ (h-r) }^{ 2 }\\ { r }^{ 2 }=h^{ 2 }\tan ^{ 2 }{ x } +{ h }^{ 2 }-2hr+{ r }^{ 2 }\\ { h }^{ 2 }\sec ^{ 2 }{ x } -2hr=0\\ h(h\sec ^{ 2 }{ x } -2r)=0\\ h>0,\quad...

Re: HSC 2016 2U Marathon yeah just be wary of it - but anyways sorry for all the spam earlier, i found a way to do it without any 3u will post soon :)

Re: HSC 2016 2U Marathon I thought basic circle geo was assumed knowledge but maybe your school didnt do it in year 10?

Re: HSC 2016 2U Marathon nono you can do it without any 3u i just did a dumb way hahaha edit: Wait nvm you need 3u identity to transform cos 2x if youre using cosine rule oops Let\quad s=slant\quad side\quad of\quad cone\\ { s }^{ 2 }={ r }^{ 2 }+{ r }^{ 2 }-2{ r }^{ 2 }cos(180°-2x)\\ { s...

Re: HSC 2016 2U Marathon thanks for the tip! sorry for not including a diagram earlier-hopefully this makes it clear (angle subtended at centre double angle subtended at circumference from circle geo) Also: my bad i used 3u identities to transform sin2x - you can do it with cosine rule and...

Re: HSC 2016 2U Marathon Part a: Let R=cone radius, h=cone height, r=sphere radius sorry im missing pi in the last two lines Part b: Let s=slant height of cone

Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread Hey, can someone please do these two? http://i.imgur.com/fKj2m6q.png (Ex9I) http://i.imgur.com/Okk5fO1.png (Ex9I)

Re: HSC 2016 3U Marathon What if we just make one for both Cambridge textbooks? I think a lot of the questions are coming for ext1 are coming from the yr 11 and yr 12 cambridge textbooks (eg. all of mine haha). At the moment there's a thread for yr 11 cambridge but not for yr12

Re: HSC 2016 3U Marathon cool thanks, on second thought I probably should have just looked it up hahaha here's another http://i.imgur.com/Okk5fO1.png

Re: HSC 2016 3U Marathon These two please if anyone is willing :) http://i.imgur.com/dYvwTlF.png http://i.imgur.com/fKj2m6q.png

Noble gases can react under extreme conditions - usually very high temperature and an extremely electronegative reactant (eg. oxygen/fluorine) are required

Brief notes, lots of past papers