# Search results

1. ### Procrastinating

This will be my last post, BOS is literally the ultimate form of procrastinating. You feel as though you are doing work yet BOS is simply another form of social media. Its been a fun ride.
2. ### What's a good question book to buy for math extension s?

no need to buy anything just cambridge+thsc
3. ### Maths help

yeah should have been \frac{\sqrt{2}}{2}
4. ### Maths help

\cos{x}\cos{y}-\sin{x}\sin{y}=\frac{1}{4}(\sqrt{3}-\sqrt{2})-\frac{1}{4}(\sqrt{3}+\sqrt{2}) \cos(x+y)=-\frac{\sqrt{2}}{2} x+y=\frac{3\pi}{4} Since second quadrant.
5. ### Mod 6 phyz

The main reason is that you need to use transformers for a bunch of appliances (e.g. if your phone charger didn't have a transformer built into it, it is going to explode if it gets the 230V coming from the plug point). Transformers only work for AC current and not DC so of course AC is preferred.
6. ### Israel Palestine conflict

damn thats a lot of responses
7. ### Israel Palestine conflict

You can be atheist and also jewish
8. ### Israel Palestine conflict

I thought he was jewish
9. ### Is the half angle formula ever in the HSC syllabus?

If you mean t formulae then yes you need to know it
10. ### Is the half angle formula ever in the HSC syllabus?

wdym half angle formula?
11. ### Challenging equations questions (I need working out please)

Who is the girl for c lol
12. ### Practice Trial HSC Questions HELP

I don't think your right for ii. If we have a graph of f(x) and want to sketch |f(x)| all parts of the graph below the y axis is flipped along the x axis. Hence the left branch of the hyperbola now becomes completely positive as shown: from i we found that the poi is (-2,2) hence the region...
13. ### Raw mark and what band

There is a complicated process the marks go through and there are many guides here on BOS you can look up, but basically your raw mark gets 'moderated,' to a moderated mark. For example those that are getting a final mark of 90 in 4U didn't really get a 90% raw in 4U and actually got around 70s.
14. ### How many units and what counts?

https://www.hscninja.com/atar-calculator
15. ### How many units and what counts?

Sorry to say but generally around 30 people get band 6 for chem in syd girls (ofc there is the outlier which is 2019). A good school definitely helps, but you must still have generally good ranks for a band 6.
16. ### Raw mark and what band

https://rawmarks.info/
17. ### Non-differentiable curves

A curve isn't differentiable at a point if it satisfies either of two conditions: 1. Its not continuous at that point (i.e. its not defined there) 2. Has a cusp (a steep point in a graph) A classic example of a curve with a cusp is y=|x| which isn't differentiable at x=0. Any curve having a...
18. ### pronouns

You actually know a 'kitty?'
19. ### pronouns

Yeah I see what you mean
20. ### pronouns

Yeah so Im assuming if you are friends with a 'kitty,' (lol) you may want to use kitty as this is more friendly than using they, just like a male or female friend.