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# Edexcel A2 C3 Mathematics 12th June 2015 watch

1. The only two questions I had trouble with were 1b), writing Cos(Theta) in terms of p (I'm not great at remembering all the identities) and question 8 I think, showing Sec2A + Tan2A = (CosA + SinA)/(CosA - SinA), but I got there in the end! Overall, it wasnt that bad a paper in my opinion
2. (Original post by Nightmare8)
So weird that there wasn't a change of sign or an inverse function. Did anyone else find it weird? O.o
Absolutely. Inverse functions and "sign change => correct to 3dp" questions tend to be given marks. No given marks on this occasion though, really.
3. I got that aswell
4. guys please, what was the last question on the paper?
5. (Original post by BFP=big fat poo)
right guys im so confused now, for the range question I wrote x=0, x=0.5, x=2
many people seem to agree....
from there i got -0.7<y<0.3 or something, and people say that's wrong but I don't see where I've gone wrong??????
This is exactly what I got! Many people are saying its wrong but I can't see what else it could be.... :/
6. I really liked that paper, no lie.
7. (Original post by jf1994)
That question was only four marks wasn't it? Based on how hard people have found the paper, I don't think missing that question out even entirely would severely dent your chances, assuming you did well in all the other questions
I think it was 5, it leaves no room for error however.
8. There wasn't a question 10 was there? Only 9 questions?
9. I thought question 10 was pretty ok, got something like 269/ln2...
10. what was question 7?
11. Also guys, for the asymptotes I got 2? y=-5 and y=5?
12. For the last question:

f'(x) = -3k/(x-k)^2

Since k is a negative integer, let k = -a, where a >0.

Thus: f'(x) = +ve/+ve since any integer squared is positive.

The function is therefore increasing.

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13. When is the hitler video out?
14. (Original post by LukeTownsend123)
Attachment 426171This is what I got, people agree?

The last question, dy/dx is greater than zero since k is a negative value
15. Increasing function, as numerator and denominator of differential were positive, therefore gradient is positive and thus increasing.
16. (Original post by BenB96)
If you split the fraction to separate it out so you have 1/cos2A + Sin2A/Cos2A
I think you get to the correct solution
17. Other than the trig proof, the paper was of standard difficulty I reckon. Some questions were tricky and the format of the paper was unusual, but I wouldn't expect grade boundaries to drop more than 2 marks from last year.
18. (Original post by BFP=big fat poo)
Also guys, for the asymptotes I got 2? y=-5 and y=5?
Yes
19. Just got hold of a paper. This is what I had for question 1
Attached Images

20. What was the answer to why they can't be an inverse function of g(x)

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