C3 Jan 2012 Edexcel - Post exam discussion - Solutions and paper in first post

I see the grade boundaries dropping slightly below 60 for an A, but not by loads. I think you may get one

x.

Now that the thread is a little calmer..

for 8a if you expand sin(a+b)/cos(a+b) then split it into two fractions i.e sinacosb/cosacosb-sinasinb + cosasinb/cosacosb-sinasinb and divide fraction 1 by cosb and fraction 2 by cosa....still not getting the right answer but having the right kinda idea...how many do you think /4?

in other words, how do you think the 4 marks are going to be allocated for that q

Now that the thread is a little calmer..

for 8a if you expand sin(a+b)/cos(a+b) then split it into two fractions i.e sinacosb/cosacosb-sinasinb + cosasinb/cosacosb-sinasinb and divide fraction 1 by cosb and fraction 2 by cosa....still not getting the right answer but having the right kinda idea...how many do you think /4?

in other words, how do you think the 4 marks are going to be allocated for that q

Ugh...really should have destroyed C3. I am always riddled with silly mistakes in maths exams..misreading calculators, not simplifying fully because I cba etc...really need to start paying more attention to detail.

arsey, which paper would you say, roughly, was more difficult, C3 june 2011 or C3 january 2012?

thanks.

Sorry to butt in, but I think C3 Jan 2012 was harder than C3 June 2011

Arsey,
for question 8(c) i did (im just letting x be theta)
1 + √3 tan x = (√3 - tan x) tan (pi - x)
tan(x + pi/6) (√3 - tan x) = (√3 - tan x) tan (pi - x)
then i took everything to one side and factorised (√3 - tan x) as i thought solutions could be lost if i divided though by it.
(√3 - tan x) [tan(x + pi/6) - tan (pi - x)]=0
I got the solutions you got 5pi/12, 11pi/12 and pi/3 from (√3 - tan x)=0
The solution pi/3 is incorrect, but instead of dividing through by (√3 - tan x) you can factorise (√3 - tan x). How comes its not a solution in the range given?

If it wasn't for Question 8 I would have cruised through the whole paper - I don't belive I have ever proved the tan rule with sine and cos

8b) was ok

8c) Well the less said about it the better


Retake written all over it!

haha, same, and i messed up on the equation of the normal question, i can do those questions but just they went over board with tan! but 8b i did, couldnt do a, i think il get 1 mark for the expansion, and didnt get anywhere with c... i think if im lucky and the examiners are very nice i might scrape 60/75, but i wreckon il resit it. and anyway, get back to vet med 2012 forum!!! haha i saw u on the chem paper forum too