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lol sorry i didn't mean confused as in with the maths, but with jnney.

I am so confused.

Hi Carrot.

What you found was the area bound between the TOP half of the ellipse and the x-axis. To get the whole area, as the ellipse is symmetrical about the x-axis, the area of the other side would also be (pi)ab/2 so the total area is (pi)ab.

Re: How do I convert the residue i found from TDS into ppm, as that is the required u Convert to mg/L 5 grams = 5 x 10^3 mg = 5000 mg 20ml = 20 x 10^-3 L = 0.02 L 5000mg / 0.02 L 250000mg/L

For that last one, x^4 + 1 = x^4 + 2x^2 + 1 - 2x^2 = (x^2 + 1)^2 - 2x^2 = (x^2 + sqrt(2)x + 1)(x^2 - sqrt(2)x - 1) Partial fractions from there.

Not 1 + 49x^2? If so, that is indeed 4U unless there was a previous part to prove that it could exist as two individual fractions.

At the very least, just know how to rearrange equations and use a calculator.

So you've only gone through The Chemical Earth so far? If so, i would be worried as your preliminary finals are the end of next term. Basically what you need to gather/recall from year 11 is IMF (hydrogen, dipole-dipole & dispersion), the mole concept (very important), molar heat of...

Someone should dedicate a DropBox simply to resources that way there won't be any duplicates. Give upload rights to those who will contribute. Then make it a public folder and allow people to download.

Re: HSC 2012 Marathon :) Oh.. Sorry about that then. I wouldn't use that formula, stick to the simple \int f'(x)e^{f(x)} dx = e^{f(x)} + c and stick to 'balancing' to integrate.

Re: HSC 2012 Marathon :) The question that you got from one of your students; that i indirectly sent you :P

Re: HSC 2012 Marathon :) Same, then i realised his question is troll.

Re: HSC 2012 Marathon :) Yep. lol reason i'm posting these questions is to highlight the fact that questions may look intimidating need not be so hard as you just need to stick to basics.

Re: HSC 2012 Marathon :) Not necessarily. Could be asked in a 3U paper as a challenging question but given the substitution u = pi/2 - x and being broken up in to parts lol.

Re: HSC 2012 Marathon :) Here's a really tricky one, \int (x^4 + 2x - 1)e^{x^5 + 5x^2 - 5x}dx

Re: HSC 2012 Marathon :) Who said anything about a circle? And quadrants?

By the source, you mean the magazine name? @madharris, unfortunately it's not SMH but another magazine in the US lol. I guess i could try send an email to them requesting for the author's name. Thanks for the suggestion.

Re: HSC 2012 Marathon :) How about.. \int^9_0 \sqrt{81 - z^2} dz

Re: HSC 2012 Marathon :) Yep :D