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Re: MX2 Integration Marathon I = \frac{2}{\sqrt{4ac-b^2}} \left [ tan^{-1}\frac{2ax+b}{\sqrt{4ac-b^2}}\right ]?

nvm made a mistake

did u use complementary angles to solve? so have sinA = sinB, or cosA = cosB

An amorphous polymer (eg. LDPE), has chain branching and therefore cannot pack closely together in an orderly fashion and so the great amounts of gaps present (between each polymer molecule) will cause it to be transparent A crystalline polymer (eg. HDPE), has unbrached chains (no chain...

u used m = -1/4 (which is the gradient of a line perpendicular to secant AB, which is not the gradient of the normal at B)

did u get my PM?

25(x-1)^2 + 16y^2 = 100 \\ \\ \frac{(x-1)^2}{4} + \frac{y^2}{\frac{25}{4}} = 1 \\ a<b\\ b^2e^2 = b^2 - a^2 \\ be = \pm \sqrt{b^2 - a^2}\\ (1, \pm be) = \left ( 1,\pm \sqrt{\frac{25}{4}-4} \right ) \\ \\ ~~~~~~~~~~~= \left ( 1, \pm\sqrt{\frac{9}{4}} \right ) \\ \\ ~~~~~~~~~~~= \left ( 1, \pm...

B

Re: HSC 2013 3U Marathon Thread the easiest way to do this: (the time i wrote this, my internet got cut but luckily i saved the URL for this image)...

Re: HSC 2013 4U Marathon That is true for roots of unity, where |z| = 1 So if |z| = 1, then 1/z = z(bar)

thanks for the notice bro!

re: HSC Chemistry Marathon Archive "..will produce CO2 which will lower the pH, so the neutralization point will not be accurate" Would this explanation be suitable for a titration between NaHCO3 and HCl?

re: HSC Chemistry Marathon Archive u are the man, i've lost everything

re: HSC Chemistry Marathon Archive U can argue that with Sodium Hydrogen Carbonate + HCl, and it'll be wrong

re: HSC Chemistry Marathon Archive great work, exactly what i was looking for! yes, u can say this aswell

I am asking on behalf of a friend

Hey, I was wondering with HSC Plus whether or not I would receive bonus points for a subject that does not fall into my top 10 units. E.g. I’m currently doing 13 units worth of subjects, in the case that say I score an E3 for Extension 1 Maths but it is not high enough to be considered in my...

When i summarise notes, 100% absorbs, but it takes a lot of energy So yeh, if u can try ur best to summarise notes (either from textbook or w/e)

u have a bad teacher