[Live POV] 2023 Extension 2 Maths Paper except you are the teacher seeing it for the first time. (1 Viewer)

[harrowed2]

itute solutions, but I think their 16c is wrong: https://www.itute.com/wp-content/uploads/2023-NSW-ESA-Mathematics-Extension-2-Solutions.pdf

I think that the author of the itute solutions is saying that the ray in the 3rd quadrant could rotate within the 3rd quadrant, depending on the position of z/w. So if arg(z/w) is very close to pi/2, then the resultant ray could be very close to the negative y axis.

 

[epicmaths]

Hey I fixed it using 2 vertical phantom characters but the code is ugly

$\frac{d\ddot x}{dx}=\frac{\hskip0.012in\dot{\hskip-0.03in\vphantom x}\dot x\dot{\hskip-0.018in\vphantom x}}{\dot x}=$

View attachment 41002

Surely there's a more elegant way to fix the latex triple dot weirdness!

Any ideas?

A wild guess but \overset maybe?



\frac{d\overset{.}{x}}{dx} = \frac{d\overset{..}{x}}{dx} = \frac{d\overset{\ldots}{x}}{dx}

I've been using \underset and \overset as a crutch ever since vector notation crept into the new syllabus.

 

[ZHANDONG]

does anyone have crowd-sourced ext 2 math papers?

 

[scaryshark09]

In nesa's mg https://educationstandards.nsw.edu....-a2d37b93-72bb-4a62-b907-63aca804dc39-oL-IGGs they put this for 16c:
View attachment 42712
It is wrong. Can you see why wrong?

Spoiler: answer

Exclude negative x-axis and (0,0):
View attachment 42714
View attachment 42717

bruh nesa made this question so hard, that even they couldn't answer it
was anyone actually able to do this in the exam?