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December 06, 2021, 02:00:15 pm

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#### wingdings2791

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##### Re: VCE Methods Question Thread!
« Reply #19260 on: October 20, 2021, 09:03:27 am »
+1
Hi there,
Are complementary angles and negative angles required in Exam 1? I find it very difficult to memorise them.

Hey NCLM, exact values for these are all required for tech free. You could try drawing this at the beginning of the exam to make things easier:

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#### GreenNinja

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##### Re: VCE Methods Question Thread!
« Reply #19261 on: October 20, 2021, 10:16:01 am »
+1
Hi there,
Are complementary angles and negative angles required in Exam 1? I find it very difficult to memorise them.

Hey NCLM, exact values for these are all required for tech free. You could try drawing this at the beginning of the exam to make things easier:

(Image removed from quote.)

Memorising the exact values is definetly nessecary. Don't fret about it. It's actually pretty easy to learn.
What I did to memorise was use a table like the one attached and memorise them by reading it aloud and graphing.

Btw, there are patterns that come up like: cos 30 = (sqrt3)/2 = sin 60

Good Luck!

#### VCEStudent2034

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##### Re: VCE Methods Question Thread!
« Reply #19262 on: October 20, 2021, 02:03:42 pm »
0
Memorising the exact values is definetly nessecary. Don't fret about it. It's actually pretty easy to learn.
What I did to memorise was use a table like the one attached and memorise them by reading it aloud and graphing.

Btw, there are patterns that come up like: cos 30 = (sqrt3)/2 = sin 60

Good Luck!
Yeah, same. I find that making a pattern and just finding a weird way to remember exact values is critical, because you’ll need to know them for the exam (exam 1 especially).
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#### S_R_K

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##### Re: VCE Methods Question Thread!
« Reply #19263 on: October 20, 2021, 05:40:24 pm »
+1
In addition to the two special triangles mentioned above, another well known trick for memorising the table of values is explained in this video: https://www.youtube.com/watch?v=_KaZWu5OKag (thanks to the original creator).

(Aside: it's ironic that the creator moans about memorising stuff, but this method for remembering the table of exact values is a paradigmatic case of a rote memorisation trick, since it's just a mathematical coincidence that it works).

#### a weaponized ikea chair

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##### Re: VCE Methods Question Thread!
« Reply #19264 on: October 20, 2021, 07:03:59 pm »
+8
Might be late, but the easiest way to remember them is this (you don't need to write it out, I'm only doing it for explanation):

30-45-60 for cos is 3, 2, 1
30-45-60 for sin is 1, 2, 3

Square root the top and divide everything by 2.

#### Chocolatepistachio

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##### Re: VCE Methods Question Thread!
« Reply #19265 on: October 21, 2021, 10:05:20 pm »
0
if someone could help with this question
in a standard normal distribution find the value that is not exceeded with probability 0.875

#### fun_jirachi

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##### Re: VCE Methods Question Thread!
« Reply #19266 on: October 21, 2021, 10:35:39 pm »
+3
It would be better if you showed some progress or some attempt here.

Rephrasing the question: for some random variable $X \sim N(0, 1)$ you want to find $x$ such that $P(X < x) = 0.875$.
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#### biology1234

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##### Re: VCE Methods Question Thread!
« Reply #19267 on: October 25, 2021, 07:42:11 pm »
0
hey, could someone help me with this question. Find the inverse of the function f(x)=3x-2
thank you

#### 1729

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##### Re: VCE Methods Question Thread!
« Reply #19268 on: October 25, 2021, 08:11:06 pm »
+4
hey, could someone help me with this question. Find the inverse of the function f(x)=3x-2
thank you
Hi,
When you find the inverse of a function you swap the $x$ and $y$ values of the function, ie. you want to make $x=f\left(y\right)$.
For this problem
Rearrange $x$ and $y$ values of the function
1. $x=3y-2$, now try and rearrange this by making $y$ the subject
2. You should get $y=\frac{x+2}{3}$ $\therefore f^{-1}\left(x\right)=\frac{x+2}{3}$
for functions, could someone explain placing restriction on inverse function on x values. thank you
I am not too sure what you mean by this, do you mind posting a particular example?
Please also remember that the condition for a function to be invertible or to have an inverse function is that it needs to be one to one. Meaning that different $x$ values map to different $y$ values, to test if a function is one to one try using the horizontal line test.

For example, $f\left(x\right)=x^2$ does not have an inverse function as it does not pass the horizontal line test, but $f:[0,\infty )\to \mathbb{R},\:f\left(x\right)=x^2$ does have an inverse function, so does $f:(-\infty ,0]\to \:\mathbb{R},\:f\left(x\right)=x^2$

hii, for this question f(x) =7x-4 would the inverse function be f -1(x) = x+4/7
thank you
Yes this is correct.

Hope this helps, and please do not spam the forums in an attempt to get an answer faster. Post as many methods questions you would like in this thread and somebody will help!
« Last Edit: October 25, 2021, 08:18:29 pm by 1729 »

#### lackconnor

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##### Re: VCE Methods Question Thread!
« Reply #19269 on: October 30, 2021, 09:05:16 pm »
0
Hey, does anyone know if the teachers or examiners clear the calculator history or files before entering methods exam 2? I have some files that will help save me time and was wondering if I should focus on not using them for revision in case. Cheers!

#### lackconnor

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##### Re: VCE Methods Question Thread!
« Reply #19270 on: October 30, 2021, 09:05:54 pm »
0
Hey, does anyone know if the teachers or examiners clear the calculator history or files before entering methods exam 2? I have some files that will help save me time and was wondering if I should focus on not using them for revision in case. Cheers!

#### jasperray

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##### Re: VCE Methods Question Thread!
« Reply #19271 on: October 30, 2021, 09:10:15 pm »
0
Hey, does anyone know if the teachers or examiners clear the calculator history or files before entering methods exam 2? I have some files that will help save me time and was wondering if I should focus on not using them for revision in case. Cheers!

They don't it says you can have full functionality on the coversheet

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##### Re: VCE Methods Question Thread!
« Reply #19272 on: October 30, 2021, 09:31:32 pm »
0
Ik this seems like a dumb question to ask, but for the actual test, are we allowed to annotate on the test paper (like for the MCQ). Like can we  make little annotations or underline words?

And just one more question , how does VCAA mark things like simplifying our answers and no. of decimal places? Like do we get penalized every time or just once?

Thanks!

#### james.358

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##### Re: VCE Methods Question Thread!
« Reply #19273 on: October 30, 2021, 09:39:01 pm »
+1
Quote
Ik this seems like a dumb question to ask, but for the actual test, are we allowed to annotate on the test paper (like for the MCQ). Like can we  make little annotations or underline words?

Yep! Feel free to annotate it however you want. The only thing getting marked from this section is your answer sheet.

Quote
And just one more question , how does VCAA mark things like simplifying our answers and no. of decimal places? Like do we get penalized every time or just once?

Unfortunately you'll lose the answer mark every single time you forget to round to the right decimal places. They're very stringent about you putting the answer in the right form (if asked), and also whether you round your answer to the correct decimal place. Seems unfair, but even for a one marker if you get the correct answer but fail to round as it asks, you'll lose the whole mark. Make sure to be careful!
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