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# Edexcel A2 C3 Mathematics 12th June 2015 watch

1. (Original post by RR97)
Maths is different - it's 90 in each unfortunately with maths. (I'm predicted an A* so it's been explained to me)
It's a 90 average mate

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2. (Original post by Alleykat606)
what was question 9??!!
algerbraic fractions involving two variables x and k, you simplified it, you then differentiated it for b and something else after that, I see many people missed it which is good right? grade boundaries lowered!!!
3. (Original post by ArtemMakushin)
I'm not sure man, but I got a y coordinate being massive... Because the gradient of the line was 24pie for me... Did you get same?
Its 1/24pi
4. Pretty Confident i hit somewhere in the high 50s/Low 60s, reckon that will be an A grade?
5. (Original post by Bustamove)
****, made the most stupidest mistake when converting sec2A + tan2A...

why the **** did I use Tan2A = 2tanA/1-Tan^A
I should have used sin2A/Cos2A

thats 4 marks down the ****ing drain...
what did everyone get for their solutions for part b)?
Did exactly the same man.

http://strawpoll.me/4609429
7. (Original post by dhamm)
So did you draw on an asymptote for that one?
No I just wrote no asymptote

We shall have to wait for Lord Arsey to confirm if I'm right or wrong
8. (Original post by Chazley123)
algerbraic fractions involving two variables x and k, you simplified it, you then differentiated it for b and something else after that, I see many people missed it which is good right? grade boundaries lowered!!!
oh PHEW i did that one....thought i missed it for a sec
9. (Original post by jf1994)
Yep, for the gradient of the line where you had to find where it crosses the y-axis i think
**** yeah!!! I got that too!
10. (Original post by frozo123)
65/75 for an A*?
hell no!!! better be like June 2013 grade boundaries or imma flip ma sheeet
11. (Original post by HGKID)
Anyone else get 4 answers for 8b?? (The one using the proof where you got tan(2theta) = -1/3
I dont think it was 2theta I believe it was just tanA= -1/3
12. (Original post by ArtemMakushin)
I'm not sure man, but I got a y coordinate being massive... Because the gradient of the line was 24pie for me... Did you get same?
(Original post by Kill3er)
Anyone get 1/24pi anywhere in any question?
i got gradient 1/24 pi because gradient is dy/dx but the graph was x=
13. (Original post by Half Crazy)
Nooo it wasn't G^-1(x) = f(x)e^-2x, it was G'(x) = f(x)e^-2x.

G'(x) is differential of G(x),
G^-1(x) is inverse function of G(x)
I almost screwed this up, but realised half way through that i was doing G^-1 (x) instead of G'(x). I think it will be a common error

14. My proof:
15. (Original post by Chazley123)
I dont think it was 2theta I believe it was just tanA= -1/3
Yeah -1/3

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16. Guys did anyone get (6pi-1)/12for the y intercept

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17. for question 9.. it's a increasing function... my friends told me just now... they were very sly about it...
Caught me out as well...

the gradient is = -3K/X something
so you would assume it's decreasing function because it's negative gradient
but at the top of the page, they said that K is a negative number

so its increasing...

Edexcel are a bunch of cheeky *****....
18. (Original post by jf1994)
No I just wrote no asymptote

We shall have to wait for Lord Arsey to confirm if I'm right or wrong
i drew the asymptote but to be fair i looked at the question and it didnt say to state the asymptotes
19. (Original post by TruMuslima)
Yep I got that. But not sure about it.

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I thought it was -5x^2. Almost sure of it
20. (Original post by ArtemMakushin)
I'm not sure man, but I got a y coordinate being massive... Because the gradient of the line was 24pie for me... Did you get same?

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