Trial Revision Thread (1 Viewer)

[vafa]

And what is auxiliary method?



Where do you put the sec² b? I still can't see it...

d/dx(tanx)=sec^x

and my friend you can always ask questions it is not a problem and i am sorry if i have made you confused. i have written an example of implicit differentiation

e.g. lny=x
1/y*dy/dx=1
dy/dx=y
but y=e^x
hence dy/dx=e^x

 

[YBK]

No,

and I think I suppose to know it already, but maybe stress has got into me...
can you please explain?

hmmm.. do you have any 3 unit book? It's pretty common... If you can't find anything, I'll explain it later (i'm really stressed now with studying for stupid trials, you probably wont understand anyway)

 

[vafa]

And what is auxiliary method?



Where do you put the sec² b? I still can't see it...

my friend, i am very sorry
because when yu type it sometimes happens i forgot to put Sec^2b in my dy/dx so you need to have dy/dx=something*1/sec^2b

I apologise for the mistake that i have done.

Really Sorry...!

 

[XcarvengerX]

(1) cos(x-3)+sin(3-x)=1

let 3-x=Alpha
cos(-alpha)=cos(alpha)
e.g. cos(-45)=cos(45) and etc

cos(alpha)+sin(alpha)=1 where alpha=3-x

and then use subsidary angles

(2) sec^2b*db/dy=(g(a(g+a)+y^2)-2gy^2)/(a(g+a)+y^2)^2

db/dy=(ag(g+a)-gy^2)/(a(g+a)+y^2)^2

If you don't mind please explain these again. What are subsidary angles? For Question 2, I actually can't interpret the first line properly, but I tried it. Is this correct? (see attachment)

hmmm.. do you have any 3 unit book? It's pretty common... If you can't find anything, I'll explain it later (i'm really stressed now with studying for stupid trials, you probably wont understand anyway)

I only have Couchman's book for 3 Unit because that's what my school can afford to give... Can I find it there?...

PS: Somehow my internet connection is so slow... can't even upload 70kb pdf file... always time out... after almost 1 hour... tell me if this upload is corrupted.

 

[YBK]

If you don't mind please explain these again. What are subsidary angles? For Question 2, I actually can't interpret the first line properly, but I tried it. Is this correct? (see attachment)


I only have Couchman's book for 3 Unit because that's what my school can afford to give... Can I find it there?...

PS: Somehow my internet connection is so slow... can't even upload 70kb pdf file... always time out... after almost 1 hour... tell me if this upload is corrupted.

it should be there.

examples:
http://community.boredofstudies.org...y-angle-method.html?highlight=auxiliary+angle
http://community.boredofstudies.org...-trig-question.html?highlight=auxiliary+angle

and damn i stuffed with 2002... it's getting on my nerves!

 

[Riviet]

and damn i stuffed with 2002... it's getting on my nerves!

Yeah it does look pretty insane... I will attempt it tomorrow!

Does anyone know how to do this, it's from '04 cssa:

Q8 (b) The number x and the real number @ are such that x + 1/x = 2cos@. Use mathematical induction to show that xⁿ + 1/xⁿ = 2cosn@ for all positive integers n > 2.

 

[Raginsheep]

The trick (with out me having actually done the question) is to realise that x can be a complex number. Just thinking about it, why not just prove deMoivre's theorem for complex numbers, and then since add xⁿ=cos n@ and its conjugate which are true by induction.

 

[bboyelement]

Yeah it does look pretty insane... I will attempt it tomorrow!

Does anyone know how to do this, it's from '04 cssa:

here it is

 

[vafa]

This is my solution for 8(b)View attachment 13487

View attachment 13488

 

[vafa]

i also looked at the solution of the previous guy.

it is good but it is incomplete because he uses s(n): x+1/x=2cos(n@) to show that x/x^k+x^k/x=2cos((k-1)@)

but i think in order to get full mark you should have a proof similar to mine and also we need to indicate that r=modulus=1

but basically his proof is the same

 

[buchanan]

Somehow my internet connection is so slow... can't even upload 70kb pdf file... always time out... after almost 1 hour... tell me if this upload is corrupted.

NSW ADSL, ADSL2+ and Dialup customers may experience browsing and/or connection difficulties due to a breakdown in core internet links. Engineers are aware of this issue and are working to resolve this ASAP. It is estimated to last untill Sunday 13 August 2006, 2:50 PM AEST

 

[housemouse]

I hope I wont be tired doing the 4 unit cssa trial tommrowo after doing biology otherwise ill be screweeeeeedddddddddd

 

[Riviet]

I hope I wont be tired doing the 4 unit cssa trial tommrowo after doing biology otherwise ill be screweeeeeedddddddddd

Get a good night's sleep tonight.

Thanks for the solutions to the induction question guys.

A question from the '03 cssa:
I don't know if it was a typo or not, but I couldn't manage to derive the expression for the volume in Q6 a) i).

 

[bboyelement]

Get a good night's sleep tonight.

Thanks for the solutions to the induction question guys.

A question from the '03 cssa:
I don't know if it was a typo or not, but I couldn't manage to derive the expression for the volume in Q6 a) i).

dunno if your used to my method but i learnt it of the cambridge book and my teacher has a different method ... so here it is
its big because my photoshop program to reduce the size expired
http://users.tpg.com.au/adslvdoo/123.JPG

 

[Riviet]

dunno if your used to my method but i learnt it of the cambridge book and my teacher has a different method ... so here it is
its big because my photoshop program to reduce the size expired
http://users.tpg.com.au/adslvdoo/123.JPG

I guess I didn't read the question properly, was finding the volume of the mould instead of the fish pond!

Thanks again.

 

[.ben]

hey bboyelement, i love your writing, it's very cool.

 

[Rax]

hey bboyelement, i love your writing, it's very cool.

Yeah, that writing was pro

 

[bboyelement]

Yeah, that writing was pro

pfftt hahahha ... thanks guys but my dad has always been criticising me with my writing he said it looks shit ...

 

[vafa]

if your dad thinks your writing is shit then how would he look at my writing?

probably supershit


well i have done most of my school years in IRAN and you need to be very quick in Mathematics and even you are not allowed to use any scientific calculator, you need to memorise standard table of integration and also some of the valuse of trigonometric identities that is why i am so bad in writing.

but clear writing is a big benefit which you have and I do not...

I am jelous of you...!

 

[YBK]

yeah your writing is awsome!

mine is what should be called crap