Search results

Hi, I was just wondering in regards to conics questions in exams that require you to find the tangent/normal/chord of contact etc, do you need to prove them from scratch for any question or are there some questions where you can just write the formula down or whatever? Thanks

Ok thanks, so you guys think that all the schools have decent past papers?

Hi, I was just wondering what half yearly 4U papers are good to practice on? Or are they all good? Thanks

Re: HSC 2015 4U Marathon P(asec\theta ,btan\theta ) \ $lies on the hyperbola$ \ \frac{x^2}{a^2}-\frac{y^2}{b^2}=1 $ \ with foci (\pm ae,0) $Show that$ \ PS=a(esec\theta -1) \ and \ PS'=a(esec\theta +1)

Thanks swagmeister, that was very helpful. :haha:

Hi can someone please help me with these two textbook questions about the CAD. 1. Explain two ways in which a CAD can be financed. 2. Explain three possible effects of an increase in CAD on economic and trade performance. For 1, I thought that the CAD is financed by the capital and...

ask adrita

Re: HSC 2015 4U Marathon 0=x^8-1 0=(x^4-1)(x^4+1) 0=(x^2-1)(x^2+1)(x^4+1) 0=(x-1)(x+1)(x^6+x^4+x^2+1) \therefore \ $Solutions of P(x)=0 are the solutions of$ \ x^8=1 \ $where$ \ x\neq \pm 1 \therefore \ $Solutions are:$ \ x=cis\pm \frac{\pi }{4}, cis\pm \frac{\pi }{2}, cis\pm \frac{3\pi }{4}...

English: Read text(s) and analyse, make notes, write an essay, etc Maths: Do exercises All the others: Start writing notes/reading textbooks/doing questions Don't worry too much. Yr11 isn't that important.

Thanks!!! I found a 2004 thread which explained it quite well, hence why I deleted the thread :P. But ofc you explained it better.

Re: HSC 2015 4U Marathon I did it by equating the coefficients of the x terms. So if you just let -2Re(z)=n, then by looking at the brackets: (x^2 +nx+7)(x^2+nx+7) you know that the sum of the x terms will be 7nx+7nx which =-56x. Then 14n=-56, n=-4. Your method is good :). An alternative...

Hey. So just like the title says, in what ways are voltage transformations related to the law of conservation of energy? Thanks. :santa:

Re: HSC 2015 4U Marathon $Suppose$ \ 0\leq x\leq \frac{\sqrt{2}}{2} $i) Show that$ \ 0\leq \frac{2x^2}{1-x^2}\leq 4x^2 $ii) Hence show that$ \ 0\leq \frac{1}{1-x}+\frac{1}{1+x}-2\leq 4x^2

Re: HSC 2015 4U Marathon $Let$ \ P(x)=(x-z)^2(x-\bar{z})^2 =(x^2-2Re(z)+|z|^2)^2 $By inspection$, P(x)=(x^2-4x+7)^2 \ $over$ \ \mathbb{R} \therefore \ $By evaluating the real part and modulus of z,$ \ Re(z)=2, \ Im(z)=\pm \sqrt{3} \therefore \ $Roots are:$ \ x=2\pm \sqrt{3}i --...

What about this? http://www.unsw.edu.au/unswprep17-19

Very helpful, thanks guys! :D

How does the equivalence of energy and mass (E=mc^2) really fit in to the topic of special relativity? Is it to do with mass dilation?

Well I agree with Astro. Keep it and try and improve unless you feel like you aren't enjoying it and it is becoming a burden.

Did you find the test hard? Or did you just make lots of silly mistakes?