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March 29, 2024, 10:50:27 am

Author Topic: VCE Methods Question Thread!  (Read 4802915 times)  Share 

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MoonChild1234

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Re: VCE Methods Question Thread!
« Reply #18975 on: November 15, 2020, 08:03:16 pm »
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Can someone help with this question? i do not understand which value for x to omit for part c
excuse the messy math  :P

since a<0, you omit the solution which has a as being a positive coordinate.

dylan.kumar21

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Re: VCE Methods Question Thread!
« Reply #18976 on: November 15, 2020, 08:49:20 pm »
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since a<0, you omit the solution which has a as being a positive coordinate.

Im sorry could you please elaborate?

tiredandstressed

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Re: VCE Methods Question Thread!
« Reply #18977 on: November 15, 2020, 09:42:08 pm »
+1
Im sorry could you please elaborate?
So in part c it says for a<0
That means your coordinate needs to satisfy the condition that a<0 (i.e a is negative)
So once you work out the x coordinate simply omit the one with a positive a value
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Re: VCE Methods Question Thread!
« Reply #18978 on: November 16, 2020, 12:52:19 am »
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no worries! Yes it is fine to put it in radians but personally I would recommend degrees

Respectfully, I disagree. For methods, typically you're using sin, cos, and tan in the context of circular functions, not in terms of geometry problems - and when using them in functions, you're also usually using them in radian mode. Radian mode is honestly just better for methods and specialist, and you just convert to degrees (by adding the degree symbol - on the old CAS, it was ctrl+') if they ever do ask you in degrees.

You only put a neg in front of the integral when the area is with the function below the x-axis and the x-axis itself. Like you said, when it is between 2 functions, its just top-bottom function and you dont put a negative out the front, despite its location on the plane. LMK if this doesn't make sense :)

I also just want to add to this - the reason you don't need to split them up when there's two functions is because the negatives and positives end up fixing themselves. It's very long and complicated to show why, but it's not just a case of, "oh, this is an exception to the rule" - there's a reason we can do things differently in this case, and it's worth understanding that reason.

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Re: VCE Methods Question Thread!
« Reply #18979 on: November 16, 2020, 09:43:19 am »
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Is the addition rule (probability) something I should put into my bound reference?
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Re: VCE Methods Question Thread!
« Reply #18980 on: November 16, 2020, 09:58:26 am »
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Is the addition rule (probability) something I should put into my bound reference?

It can't hurt, and if it's something you struggle remembering, then it's definitely useful putting in there.

Personally, I really love the consolidation of the bound reference at the end not because it lets you put all the information in a book you take into the exam - but because that consolidation will help you with remembering all the little things you might have forgotten. So yeah - if the addition rule is something you might have forgotten, then 100%, chuck it in there - because having that information can't hurt, and by putting it in there and taking the time to consciously write it on paper, that might help you remember it for both exams, so that you don't even need to look at it, anyway, if it comes up

cherryblossoms

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Re: VCE Methods Question Thread!
« Reply #18981 on: November 16, 2020, 11:50:15 am »
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Do we get scrap paper for the exams? And since we have to write in pen, what do I do if I make a mistake but there's no more space for working out?

MoonChild1234

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Re: VCE Methods Question Thread!
« Reply #18982 on: November 16, 2020, 12:20:31 pm »
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Respectfully, I disagree. For methods, typically you're using sin, cos, and tan in the context of circular functions, not in terms of geometry problems - and when using them in functions, you're also usually using them in radian mode. Radian mode is honestly just better for methods and specialist, and you just convert to degrees (by adding the degree symbol - on the old CAS, it was ctrl+') if they ever do ask you in degrees.


Oh I completely agree with you! Sorry, I should have specified what I meant: I thought the question was asking specifically when they ask for the angle between the line and the x-axis when you use the gradient (tan^-1(m)). Usually in these cases they ask for degrees anyway :)

MoonChild1234

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Re: VCE Methods Question Thread!
« Reply #18983 on: November 16, 2020, 12:24:16 pm »
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Do we get scrap paper for the exams? And since we have to write in pen, what do I do if I make a mistake but there's no more space for working out?

No unfortunately you don't get scrap paper. Correct me if I'm wrong but VCAA has approved the use of pencil for this year so you could use that. Also, if your bound ref has spare pages in it you can write in that for working out if you wanted to.

Coolgalbornin03Lo

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Re: VCE Methods Question Thread!
« Reply #18984 on: November 16, 2020, 02:27:09 pm »
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For binomial by hand are there certain factorial tricks to remember?

Like 5|0 factorial = 1 for example (I know that’s not correct but I’ve tried googling and flipping the Cambridge text book but I can’t find it!) I’m so scared it’ll be on their tomorrow
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Re: VCE Methods Question Thread!
« Reply #18985 on: November 16, 2020, 03:08:30 pm »
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For binomial by hand are there certain factorial tricks to remember?

Like 5|0 factorial = 1 for example (I know that’s not correct but I’ve tried googling and flipping the Cambridge text book but I can’t find it!) I’m so scared it’ll be on their tomorrow
Wait, what of the probability stuff do we need to know how to do by hand?! I only learnt the probability stuff last week  ::) and thus haven't done much....
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MoonChild1234

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Re: VCE Methods Question Thread!
« Reply #18986 on: November 16, 2020, 03:47:54 pm »
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Wait, what of the probability stuff do we need to know how to do by hand?! I only learnt the probability stuff last week  ::) and thus haven't done much....

I think pretty much everything except evaluating the normal distributions (because you usually use the CAS for that)
But with normal, you will need to know how to standardise it and sometimes evaluate it through that

Coolgalbornin03Lo

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Re: VCE Methods Question Thread!
« Reply #18987 on: November 16, 2020, 08:16:51 pm »
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In question 5b of 2019 exam 1 why does the fraction not get anti differentiated into a Log? Is it because the denominator is raised to a power more than one?
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MoonChild1234

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Re: VCE Methods Question Thread!
« Reply #18988 on: November 16, 2020, 08:19:10 pm »
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can anyone please help with 2018 Exam 2, question 2c, I'm not understanding why we have to integrate to get the answer. Also, I know the original equation b(t) gives us the amount of drug in the bloodstream but what does the derivative and integral give us?
thanks

You have to integrate because the question asks for average amount, This is essentially a way of saying average value, and so you use the average value formula. The derivative gives the rate of change and I'm pretty sure the integral gives the total amount consumed so far or something like that (not super sure about this)

MoonChild1234

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Re: VCE Methods Question Thread!
« Reply #18989 on: November 16, 2020, 08:20:41 pm »
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In question 5b of 2019 exam 1 why does the fraction not get anti differentiated into a Log? Is it because the denominator is raised to a power more than one?

Yes, it is raised to a power of -2 if you bring it to the top, meaning it won't be a log if you antidiff. You only get a log from antidiff if you have a power of -1