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Edexcel C2 20th May 2015 *Official Thread* watch

1. People are saying this is easy? The smartest people I know said it was harder than the Solomon papers which I agree.

I had no clue what to do with the 2sinx+root3cosx

I fluffed up on the arithmetic series questions.

The last question was pretty easy. I got r=2.92 which is £3 which seems reasonable. And for proving it was the minimum I got 59.2 which is positive, hence its the minimum.

Q1-4 were fodder.

The question on that shape was really easy

The cosine one with k in it was okay. I ended up with k/4 which is 3/4 which I got x=0,41.1,180,318.8 for when cosx=-1 and cosx=3/4
2. (Original post by JamieLegg)
A = 18
R = 8/9

N = 28

Cost was like 520 ish
no...the cost was ike 483/484 ish...most people got that
3. (Original post by tayloryeah)
What did you get for the intergration area curve Q?
226

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4. (Original post by target21859)
For the question where you had to express cosx in terms of k, did you get 4cos^2x-cosx-k=0?
Yep
5. How many marks would I lose if I didn't sub r back into the cost equation?
6. (Original post by target21859)
For the question where you had to express cosx in terms of k, did you get 4cos^2x-cosx-k=0?
yep, then I used the quadratic forumual to find cosx in terms of k
7. (Original post by enaayrah)
I got something like that
Omg same
8. is it cosx=k and cosx=(k+1)/4????

I only got x=0 for part C
9. What even was that.
10. (Original post by target21859)
For the question where you had to express cosx in terms of k, did you get 4cos^2x-cosx-k=0?
Yes. I left it like that too though i didn't think it was clear how they wanted it

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11. For the integration find the area question, i didnt integrate them seperately and got a wrong answer:\\
how many marks was it worth and how many would i get :\
I actually did try to integrate it seperately on the other side of the paper but then i think i crossed it out
12. (Original post by lukejoshjames)
Really easy paper, I think I only slipped up on the Cos in terms of k question. What did everyone get for that?
4cos^2x - cosx = k
13. I really hated that exam im hoping the grade boundaries are low
14. (Original post by target21859)
For the question where you had to express cosx in terms of k, did you get 4cos^2x-cosx-k=0?
Yes but you had to equate k to 4cos^2x-cos2x, hence why they stated in express in terms of k
15. messed up the factorisation....forgot to put 3 outside the brackets.....messed up the trig ques
16. (Original post by tayloryeah)
I got a 194, 32 from 0 to 4 plus 162 from 4 to 9, how did you get 224?
Thats also what I got

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17. (Original post by Dinaa)
Exactly how i feel at the moment
18. (Original post by Dieselblue)
People are saying this is easy? The smartest people I know said it was harder than the Solomon papers which I agree.

I had no clue what to do with the 2sinx+root3cosx

I fluffed up on the arithmetic series questions.

The last question was pretty easy. I got r=2.92 which is £3 which seems reasonable. And for proving it was the minimum I got 59.2 which is positive, hence its the minimum.

Q1-4 were fodder.

The question on that shape was really easy

The cosine one with k in it was okay. I ended up with k/4 which is 3/4 which I got x=0,41.1,180,318.8 for when cosx=-1 and cosx=3/4
You had to sub r = 2.92.. back in to find the actual cost

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19. The cubic factorisation was 3(2x+1)(x+4)(x-4)

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