#### mreditor16

##### Well-Known Member
Re: hmmm.

I think a slightly shorter method to ii of circle geo was vert Opp angles with opa then alternate segment theorem but with angle cpq
agreed my method was way too long. I tend to do that a lot with circle geo...

#### mreditor16

##### Well-Known Member
Re: hmmm.

fucking helllllll. I wrote y/x=t but subbed in x/y=t and got centre as (a,0). How many marks lost, if I showed that I subbed it in from there but then accidently subbed wrong thing in? fuck that shit man. This was a easy 100. I am gonna fucking rip my brain apart and fucking throw it in the bin. Why the fuck didn't it understand what the probability question was trying to say and why the fuck did it make stupid mistakes.
I feel for you man. but take it to general thoughts. but dw bout it now

Re: hmmm.

Q14 and

#### Attachments

• 61.4 KB Views: 169
Last edited:
IR

#### dunjaaa

##### Active Member
Re: hmmm.

I agree with you, I would have killed this paper if I sat it this year

#### IR

##### Active Member
Re: hmmm.

I thought about using limiting sum for second part. Should work though

#### mreditor16

##### Well-Known Member
Re: hmmm.

okay here's 14 a)

#### dunjaaa

##### Active Member
Re: hmmm.

I did use limiting sum for (ii)

##### i'm the cook
Re: hmmm.

Acceleration is m/s^2
if i lose a mark for not writing the unit on this i will be flipping tables

Re: hmmm.

and done....

#### anomalousdecay

Re: hmmm.

if i lose a mark for not writing the unit on this i will be flipping tables
I think you should be fine. Coming from a Physics student though I would've expected for you not to miss the units

##### i'm the cook
Re: hmmm.

I think you should be fine. Coming from a Physics student though I would've expected for you not to miss the units
i actually circled them in my booklet and put the units in for part i

#### methextension2

##### New Member
Re: hmmm.

anybody gonna get 100? i think i got 70/70

#### dunjaaa

##### Active Member
Re: hmmm.

Yeah haha, I was in a rush and forgot to add "since 0<r<1"

#### Sam1212

##### New Member
Re: hmmm.

Hey, for the question containing sin2x -cos2x =0, therefore sin2x = cos2x. Then u change it to cos2x = cos (pi/2 - 2x) so then 2x = pi/2 - 2x. therefore, 4x = pi/2. therefore, look at the limits, 0<4x< 2pi. Therefore, 3pi/2 is also considered a solution. therefore, 4x = pi/2 and 3pi/2.
x = pi/8, x = 3pi/8. Both these satisfy the limits, so does that mean your solution is missing another value?

##### i'm the cook
Re: hmmm.

Hey, for the question containing sin2x -cos2x =0, therefore sin2x = cos2x. Then u change it to cos2x = cos (pi/2 - 2x) so then 2x = pi/2 - 2x. therefore, 4x = pi/2. therefore, look at the limits, 0<4x< 2pi. Therefore, 3pi/2 is also considered a solution. therefore, 4x = pi/2 and 3pi/2.
x = pi/8, x = 3pi/8. Both these satisfy the limits, so does that mean your solution is missing another value?
no because it's only max for pi/8 using other methods

##### i'm the cook
Re: hmmm.

anybody gonna get 100? i think i got 70/70
unsure about whether i'll lose a mark for missing units in 12.a.ii but otherwise it's looking good

#### youngsky

##### poof
Re: hmmm.

unsure about whether i'll lose a mark for missing units in 12.a.ii but otherwise it's looking good
state rank imminent

#### IR

##### Active Member
Re: hmmm.

if i lose a mark for not writing the unit on this i will be flipping tables
U will. Thats why it was 2 marks.