/0's Methods thread

[/0]

Unless specifically asked to do so, you do not have to prove that you have a maximum or minimum. Just simply state the maximum (or minimum or stationary point of inflection) occurs at gradient = zero

I thought it was expected for you to always justify. In fact, in some questions, they say "You are not required to justify the nature of the stationary point", which I think implies that at all OTHER times, you must.

I hope you're right though, it would be a lot easier...

No, you only ever have to justify the type of stationary point if the question asks it. VCAA will specifically ask on the exam if they want it or not.

Thanks, that makes me feel a lot more at ease

[/0]

I really newbie question here...

If you say midnight Tuesday, does that mean the beginning of Tuesday or the end of Tuesday?

[bucket]

beginning, midnight is 00:00 o'clock

[/0]

thanks bucket

another:

Consider

Find the rule of .

[Mao]

for that domain, , range is



,

[unknown id]

Hmm, I might be wrong but i got , ...

[dekoyl]

Consider

Find the rule of .

/0 which exam is this from? I remember this question and I also remember how I completely stuffed it up.
Is it an iTute one? TSFX? I forgot

And thank you.

[dekoyl]

I'll attempt it.
lies in the domain of



Swap and etc..



,

Sorry if this is so damn wrong. 

PS How do you do the "element" symbol in TeX?
PPS /0 Are you doing CAS?

[Mao]

Hmm, I might be wrong but i got , ...

yes, you are quite right.

i don't know wtf i was smoking, haha.

[/0]

Thanks dekoyl and mao that cleared it up   (btw dekoyl it's from itute 2008)

I've got another one though :O

for the attached picture, they say the answer is B. Shouldn't it be C? or doesn't the domain matter

[dekoyl]

Hmm.. you're right.
Without considering the domain, the asymptotes are at and
But this is a stupid question which I've never asked. Is the asymptote part of the function?
Asymptotes only shows where the function approaches, and it isn't affected by the domain.

i.e. The domain restricts function, not the asymptotes.

PS. This look familiar too Dammit.

[dekoyl]

PS. This look familiar too Dammit.

itute 2008 exam 2

Oh yeah that's right. Because I did them this over this long weekend

So is that question you're asking B or C? or is my reasoning completely off? If so please correct me

Where's Mao or Coblin hehe.

[Mao]

I would say C. the asymptotes should have been at -pi and pi, though that falls outside of the domain.