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  1. porcupinetree

    2016ers Chit-Chat Thread

    Adding a little bit of eggplant also makes it much more tasty :)
  2. porcupinetree

    2016ers Chit-Chat Thread

    gets awkward when @ekman decides to get tomato and bbq sauce on his hsp #neverforget #neverforgive
  3. porcupinetree

    What does the dot mean in the middle of chemical compounds?

    It doesn't represent a mixture. It represents an actual compound with a definite ratio of constituent parts.
  4. porcupinetree

    Uni maths textbook/international textbook which are relevant to the HSC syllabus

    +1 for Spivak. Read some of it during my HSC year, found it really good/interesting. (And am currently using (and loving) it now that I'm actually doing uni maths)
  5. porcupinetree

    What's worth getting tutoring for, Ideas to implementation or Quanta to Quarks?

    Out of the two, Ideas is defs the one which has more difficult concepts (lots of Quanta is just content to memorise rather than concepts to understand), so perhaps Ideas
  6. porcupinetree

    Calculus & Analysis Marathon & Questions

    Re: First Year Uni Calculus Marathon A1: $Define a new function $h(x) = f(x) - rg(x)$ such that $h(a) = h(b)$: $$f(a) - rg(a) = f(b) - rg(b)$ \Rightarrow r = \frac{f(a) - f(b)}{g(a) - g(b)} $ \therefore h(x) = f(x) - \frac{f(a) - f(b)}{g(a) - g(b)} g(x)$ $$h$ is continuous on...
  7. porcupinetree

    Calculus & Analysis Marathon & Questions

    Re: First Year Uni Calculus Marathon Do you have any hints as to what the 'suitably chosen function' is? I'm struggling to find it
  8. porcupinetree

    Prelim Chem Thread

    Same
  9. porcupinetree

    HSC 2016 MX1 Marathon (archive)

    Re: HSC 2016 3U Marathon
  10. porcupinetree

    2016 HSC Exam timetables

    I reckon by the time it's October you might be happy that they're all packed together - means you get them over and done with sooner.
  11. porcupinetree

    HSC 2016 MX2 Marathon (archive)

    Re: HSC 2016 4U Marathon
  12. porcupinetree

    Dot product

    It's part of the geometric definition of the dot product.
  13. porcupinetree

    HSC 2016 MX1 Marathon (archive)

    Re: HSC 2016 3U Marathon Use Pythagoras' theorem to find half the length of the chord, then double your answer.
  14. porcupinetree

    2016ers Chit-Chat Thread

    Literally the opening paragraph of ml125's autobiography
  15. porcupinetree

    Calculus & Analysis Marathon & Questions

    Re: First Year Uni Calculus Marathon \lim_{x \rightarrow 0} \left(\frac{1+\tan{x}}{1+\sin{x}}\right)^{\frac{1}{\sin{x}}}
  16. porcupinetree

    Any schools teach perms and combs in year 11

    +1 Why wouldn't they teach it?
  17. porcupinetree

    Prelim Physics Thread

    It's more correct to say that the gravitational force supplies a centripetal force, allowing the orbiting object to undergo circular motion. (Note: (I'm not accusing you of this necessarily but it might help) it's a very common trap for students to think that when an object is undergoing...
  18. porcupinetree

    Calculus & Analysis Marathon & Questions

    Re: First Year Uni Calculus Marathon Also, regarding your proof, I think you need to the read the question again. (Particularly the definition of f(x))
  19. porcupinetree

    Calculus & Analysis Marathon & Questions

    Re: First Year Uni Calculus Marathon Part 1 (not a very rigorous proof, though): $As $x\rightarrow \infty $, $x^3 + 1 \rightarrow x^3 $As $x\rightarrow \infty $, $x^2 + 1 \rightarrow x^2 $Thus, $ \lim_{x \rightarrow \infty} \frac{\ln (x^3 + 1)}{\ln (x^2 + 1)} =...
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