VCE Methods Question Thread!

[speedy]

Don't think I'll be getting this anytime soon so complicated it hurts LOL.

Break it up into steps:

1. Put points on the x-axis where the original function has turning points

2. Work out the nature of these points -> indicate how the derivative graph approaches these points (from above [+ve]. from below [-ve]...)

3. Check for points that can't be differentiated

4. Sketch graph, ensuring shape corresponds to derivative of each section

[Jason12]

for dy/dx of [cos(2x)/3x] I got cos(2x)/(3x^2) + 2sin(2x)/(3x). Is this correct? If not, what did I do wrong? The answers are simplified in a different way so can't tell

[RKTR]

for dy/dx of [cos(2x)/3x] I got cos(2x)/(3x^2) + 2sin(2x)/(3x). Is this correct? If not, what did I do wrong? The answers are simplified in a different way so can't tell

i got -cos(2x)/(3x^2) - 2sin(2x)/ 3x

[Valyria]

Hello,

How would you treat 'a' in the transition form? Would we convert it to its fractional form?

[RKTR]

Hello,

How would you treat 'a' in the transition form? Would we convert it to its fractional form?

yup a% = a/100

[Yacoubb]

for dy/dx of [cos(2x)/3x] I got cos(2x)/(3x^2) + 2sin(2x)/(3x). Is this correct? If not, what did I do wrong? The answers are simplified in a different way so can't tell

I got:

[cos(2x) - xsin(2x)] / 3x^2

^^ this is after simplification.

[myanacondadont]

How do you find steady state probabilities in a tech-free exam? I know you need to add/divide some of the probabilities in a transition matrix but I'm not sure which/why.

[GeniDoi]

How do you find steady state probabilities in a tech-free exam? I know you need to add/divide some of the probabilities in a transition matrix but I'm not sure which/why.

If your transition matrix is:
           A    B
A    [  0.3   0.5   ]
B    [  0.7   0.5   ]

The long term Pr(A) =  0.5 / (0.5 + 0.7)
The long term Pr(B) =  0.7 / (0.5 + 0.7)

EDIT: The reason why its like that is because were interested in the probability of changing from, for ex, B to A, divided by the sum of the two probabilities that result in a change (0.5 + 0.7 in this case - its ok if this number is greater than 1). That will tell us the exact long term probability of sticking with A. Or vice versa for A to B.

[jessss0407]

Does anyone know if we can have blank pages in our bound ref? Thanks!

[Reus]

Does anyone know if we can have blank pages in our bound ref? Thanks!

Apparently so

[BLACKCATT]

Does anyone know if we can have blank pages in our bound ref? Thanks!

Yep, if they didn't allow that then it would be quite troublesome

[GeniDoi]

I called VCAA this morning and the grumpy sounding lady said you aren't allowed any blank pages in your reference book, nor are you allowed to write in it. Better safe then sorry.

[BLACKCATT]

lol wut. Srs?
I had blank pages in my notes for further last year..

[GeniDoi]

lol wut. Srs?
I had blank pages in my notes for further last year..

She was dead serious but I really don't know. Seems like nobody knows about this rule (no teacher has ever told me about it) so maybe its not strictly enforced?

[Reus]

Just write y=2x in every page that's blank hahahahaha