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  1. Affinity

    before 1999 hsc solutions..

    Check local library
  2. Affinity

    induction

    1. By inspection: RHS = 2^n * 3^n * 4^n * ... * (n+1)^n LHS = 2^n * 3^(n-1) * 4^(n-1) * 5^(n-2) * 6^(n-2) * ... * (2n-1) * 2n = 2^n * [3^(n-1) * 2n] * [4^(n-1) * (2n-1)] * [5^(n-1) * (2n-2)^2] * [4^(n-1) * (2n-3)^2] * ... Arranged this...
  3. Affinity

    explain?

    In practice yes. But would be nice if you can highlight the important parts
  4. Affinity

    exact value of tan10

    That's useless... it's essentially saying tan(10) = sin(10)/cos(10)
  5. Affinity

    induction with k parameters

    $let $y_n = x_n - 1$, then $y_n > 0$ and the inequality is \empha{equivalent} to \\ $ \prod_{n} (1+y_n) \geq 1 + \sum_{n} y_n$ \\expanding the left hand side shows that it is \emph{equivalent} to\\ $1 + \sum_{n}y_n + \sum_{\alpha,\beta:\\ \alpha \neq \beta} y_\alpha y_\beta +...
  6. Affinity

    Quick question

    It's just notation.. I don't see anything wrong with cis.. but e^(ix) is probably the better notation.
  7. Affinity

    MX2 Past Papers & Answers

    Re: I just need the 01 and 08 James Ruse papers now. What is this obsession with papers
  8. Affinity

    Complex Question - The Kings

    It's not quite a complex number question... roughly: you can use a counting argument 1. Notice that z^n =1 has n distinct roots and that n is a finite number. 2. also, z_k, z_k^2 , ... , z_k^n are all roots of z_k^n = 1 (trivial) 3. We just need to show that no two in the above list are equal...
  9. Affinity

    fail at 4unit

    Search for the report from the technical scaling committee each year
  10. Affinity

    Is it possible to do 4 unit maths by yourself?

    It is possible, but if you have to ask this question, you will probably need osme help
  11. Affinity

    Inequalities

    Classic Proof for the Cauchy Schwarz inequality. You can also substitute: x = \dfrac{ab+cd}{a^2 + c^2} into f(x) Now try this Use the fact that f(x)=|ax-b|^2+|cx-d|^2\geq 0 to prove |a\bar{b}+c\bar{d}|\leq \sqrt{(|a|^2+|c|^2)(|b|^2+|d|^2)} where a,b,c,d are complex numbers
  12. Affinity

    MX2 Mathematical Induction

    this has nothing to do with the question
  13. Affinity

    MX2 Mathematical Induction

    For n = 1,2,3,4 find the number of ways of placing n letters in n envelops such that no letter is in the correct envelope ( assume the letters and envelopes form pairs) Prove that in general for n >= 0 the following formula gives the number of ways n!\sum_{k=0}^n \dfrac{(-1)^k}{k!}
  14. Affinity

    MX2 Mathematical Induction

    prove that a cube can be divided into exactly n cubes for each n >= 100, (the sizes of the cubes need not be the same)
  15. Affinity

    Conics

    measure of how much the curve differs from a circle.
  16. Affinity

    Extremely basic question [mechanics]

    doesn't matter in cases where your mass in constant.
  17. Affinity

    Trigonometric Manipulation in Mechanics Question

    just substitute... cos(pi/2) = 0 and a2 - a1 is what is there
  18. Affinity

    Actuarial Studies - right path for me?

    the devil's in the details
  19. Affinity

    Investment Banking - any advice?

    I've been reading up about different career paths available upon completion of a Commerce/Business degree. Investment Banking seems to be a well regarded career option in terms of salary, opportunity to advance to higher managerial positions within companies and chances to network with high...
  20. Affinity

    macquarie or UWS

    The one which is harder to get in... despite all this BS about how UAI/ATAR cutoffs has nothing to do with the course blah blah. ---> people aren't stupid, the good courses has more applicants which pushes the cut offs up. Maybe this is not entirely valid for different courses, but it is...
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