Akshara Patil
Active Member
- Joined
- Mar 12, 2022
- Messages
- 105
- Gender
- Female
- HSC
- 2022
^^^^how would you "show" to actually get the marks?
-
Finished your HSC? Check out our University Discussion, Non-School forums or help out next year's HSC students! -
YOU can help the next generation of students in the community! Share your trial papers and notes on our Notes & Resources page
pretty obvious q but... (1 Viewer)
- Thread starter Akshara Patil
- Start date
5uckerberg
Well-Known Member
- Joined
- Oct 15, 2021
- Messages
- 562
- Gender
- Male
- HSC
- 2018
ci) First you are told that you have two right angles at A and also note that 
. How is that useful because now you can write 1 for OA and 
for AB and AC which will come in handy.
There use Pythag to find the length of
which will come in handy.
There we will use the mod arg form to find that+i\sin\left(\frac{\pi}{3}\right)\right)z_{1})
. Noticing that +i\sin\left(\frac{\pi}{3}\right)\right))
is the extension and rotation of 
Therefore,z_{1})
For part ii do the same but this time you will have+i\sin\left(\frac{-\pi}{3}\right)\right)z_{1})
giving usz_{1})
I mean you can apply parallelogram law for this but I think it is overkill.
by calculation will give us 
as the imaginary will perish after you subtract them.
There use Pythag to find the length of
There we will use the mod arg form to find that
Therefore,
For part ii do the same but this time you will have
giving us
I mean you can apply parallelogram law for this but I think it is overkill.