Search results

1. help

was hoping for a solution. t=tanx and from there. Is that best? Thanks.
2. help

I am trying to find the integral of dx/(3+4sin(2x)). Can anyone help? Thanks!
3. recurrence formula

Brilliant. I got to line 4 but did not then multiply by the root x^2-a^2 on itself. Thanks a lot.
4. recurrence formula

Given I_n = integral of x^n divided by sqrt(x^2-a^2) dx show that nI_n - (n-1)a^2I_(n-2)=x^(n-1)sqrt(x^2-a^2). I can't prove it. Can anyone help. Note I_n means I then subscript n like for recurrence integral questions. Thanks!
5. Syllabus development

In what year will the new national Yr 11 and 12 curriculum first be taught to Year 11 students?
6. Uni of Sydney Maths Test

Not sure if you guys have seen this before but here is a test that you can use to decide whether or not you are suited to enrolling in Advanced Level Maths at the University of Sydney. Student Self Test It's probably best to take the test after you have completed Integration and Conics from...

8. e is irrational

I agree that the method of the proof of irrationality of e that is implied by the latest Ind. trial paper is easier than the methods implied by earlier HSC questions. However, I think that the earlier HSC questions on the irrationality of e (in particular the 1993 HSC question on this topic)...
9. Syllabus development

A good question which is within the grasp of Year 12 students who are keen and committed. It's a pity the exam writers did not require the final limit as n goes to infinity to be taken! T01.
10. Syllabus development

I have had another look at the Calculus Writing Brief this morning and sadly I have found another disappointing feature. This is the removal of "Harder 3 Unit" topics. This topic has created considerable interest in the Extension 2 syllabus and content over the years. Students clearly enjoy...
11. Syllabus development

Comments are based on the material from Buchanan from May 2 under the assumption that those materials will be the basis for the syllabus review. I realise this may not be the case and that further discussion will take place! From a quick look over the Calculus brief it appears that the...
12. Parlons-nous le francais ici!

Je ne suis pas d'accord. Moi, j'ai etudie le francais pour HSC il y a longtemps et j'ai utilise la meme methode d'etudes pour tous mes matieres. J'ai recu 95 pour 2U.
13. problem from a uni student

The question stipulated that you should use a triple integral and a change of variable - testing the use of Jacobians for triple integral transformations. I agree that V=1/3Ah works for tetrahedra and that 162units^3 is the final result. Also agree with (and am heaps impressed by) the solution...
14. problem from a uni student

Find the volume of the pyramid with base in the plane z=-6 and sides formed by the three planes y=0 and y-x=4 and 2x+y+z=4. The question comes from Multivariable Calculus by McCallum et al (1997 version) page 239 Q12. It is at the end of a section on triple integrals and use of substitutions...
15. Conics Question

for an alternative approach to the problem using internal division of a line, see attached. I have updated the attachment to include all three cases.
16. New questions

I agree Sober - that is simpler for Question One. Of course both ways are valid solutions. Raginsheep - what uni Maths course has those sort of questions? I want the easy credit!
17. New questions

Here is my solution. See attached.
18. Hard Inverse Trig/Induction Question

Here is the n=k+1 part of the solution. See attached.
19. How would you sketch y = xsecx?

If the question permits, I would use Calculus to help get an idea of the shape of the curve. See attached. The curve will have maxima and minima similar to the graph of y=secx except the branches will get increasingly further from the x-axis for larger values of x. The branches will also...
20. Extension 2 Power Point Presentations

I managed to find a web site which answers my question. Demo only versions of most of the powerpoint presentations that I referred to above are available for free from http://www.dovepresent.com/pages/pres.html I've looked at the Volumes and Conics presentations and thought both were...