# Mathematics Extension 1 Exam Predictions/Thoughts (1 Viewer)

k=14 yeah

#### Arrowshaft

##### Well-Known Member
Binomial was k=14 pretty surr
Na I got 14, I accidentally wrote 15 because I was thinking of k+1

#### programen

##### New Member
symmetry does not work here

#### Arrowshaft

##### Well-Known Member
Dang it, think I messed up with some sillies. What do you think a 94% would align to?

#### Heresy

##### Active Member
Predictions for E4 cutoff?

I admit this paper was more doable than previous years. However, I definitely didnt perform the best I could today. I'm sad because i prepared hard for 3U for the past 2 years too...
Maybe 50/70, I really don't know. I'm Disappointed.

#### StudyOnly

##### Active Member
For the Rcos(x- alpha) did you guys get tan^-1(sqrt6/sqrt2) and did you leave it like that when subbing back into the Rcos(x-alpha)?

#### Arrowshaft

##### Well-Known Member
Maybe 50/70, I really don't know. I'm Disappointed.
It’s alright man, same thing happened with 4u for me. Completely bombed 13 out, somehow did most of 16 but missed out on early marks. It’ll get better from here

#### dotwingz

##### New Member
For the Rcos(x- alpha) did you guys get tan^-1(sqrt6/sqrt2) and did you leave it like that when subbing back inti the Rcos(x-alpha)?
sqrt6/sqrt2 simplifies to sqrt3 which is an exact value of tan

#### Arrowshaft

##### Well-Known Member
For the Rcos(x- alpha) did you guys get tan^-1(sqrt6/sqrt2) and did you leave it like that when subbing back inti the Rcos(x-alpha)?
that’s sqrt3 which means alpha is pi/3

#### Hithcock

##### Member
[QUOTE="TeheeCat, post: 7319008, member: 1611308748"

I admit this paper was more doable than previous years. However, I definitely didnt perform the best I could today. I'm sad because i prepared hard for 3U for the past 2 years too...
[/QUOTE]

Same here, did not do as expected

#### StudyOnly

##### Active Member
sqrt6/sqrt2 simplifies to sqrt3 which is an exact value of tan
Ohhhh no I forgot tht do you think I lose a mark or two?

#### Arrowshaft

##### Well-Known Member
Ohhhh no I forgot tht do you think I lose a mark or two?
Unfortunately but did you still plug in the number into your calculator to get pi/3?

#### Heresy

##### Active Member
Btw did anyone else use Implicit Differentiation for the rates question?

#### StudyOnly

##### Active Member
What do you guys think 57-60 out of 70 will scale to?

#### Arrowshaft

##### Well-Known Member
What do you guys think 57-60 out of 70 will scale to?
E4 at the minimum, so maybe 90-92

#### Arrowshaft

##### Well-Known Member
you’ll be right mate, I’ve seen your thought process for maths, you’re defs an e4 student

#### StudyOnly

##### Active Member
Unfortunately but did you still plug in the number into your calculator to get pi/3?
No, I just left it tan^-1(sqrt6/sqrt2) ... do you think loss of 1 or 2 marks?

#### Arrowshaft

##### Well-Known Member
No, I just left it tan^-1(sqrt6/sqrt2) ... do you think loss of 1 or 2 marks?
Only 1 mark, I’d say

#### tillitiger

##### New Member
I got 3 solutions for question 10 bcuz the domain was in between -1 and 0 and hence the sole were at x=-1, x=0 and x=somethin like -0.62

but then again, im not a nurd

#### Arrowshaft

##### Well-Known Member
I got 3 solutions for question 10 bcuz the domain was in between -1 and 0 and hence the sole were at x=-1, x=0 and x=somethin like -0.62

but then again, im not a nurd
But the domain for f(x) was x>=1 so wouldn’t the range for f-1(x) have been f(x)>=1?