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# Official Edexcel C3 Discussion Thread watch

1. (Original post by Get Cape.Wear Cape.Fly.)
Maybe not for you. But look at June 09, seriously. It'll never be that easy again. They'll probs make it 10x as hard. And our year is the first year with the A* grade, it's gonna be weird and difficult.
It'll never be that easy again because that paper failed to test the true ability in maths. Plenty of people who are brilliant at maths ended up with a B on that exam purely from making silly minor mistakes. It's significantly better to have an exam with challenging content, but low grade boundaries, than it is to have an easy paper with high boundaries; both for good mathematicians and the exam board.
2. (Original post by Pheylan)
i'm aiming for 100%
Well, I think everyone who sits the paper wants 100%! Doesn't mean they'll get it

I'd like as high as I can - but I'll be happy if I get 90%.
3. June 2006 wasn't TOO bad. I got 68/75. I made silly mistakes on the curve sketches (lost 3) and lost another 3 because I couldn't simplify the derivative of (2x - 1)tan2x.
4. (Original post by Get Cape.Wear Cape.Fly.)
Panicking works for me
I'm total opposite good luck!
5. (Original post by Noble.)
It'll never be that easy again because that paper failed to test the true ability in maths. Plenty of people who are brilliant at maths ended up with a B on that exam purely from making silly minor mistakes. It's significantly better to have an exam with challenging content, but low grade boundaries, than it is to have an easy paper with high boundaries; both for good mathematicians and the exam board.
Like June C2?
6. Question:

x = sec^y + tany

show d/dx = cos^2y/2tany +1

so
u = sec^2y
v= tany

u' = 2secy x secxtany
y' = sec^2y

= tany x 2secy x tanysecy + sec^2y x sec^2y

but the mark scheme has this?

2 sec y × sec y tan y + sec^2 y = sec^2 y(2 tan y + 1)

wher have i gone wrong?
7. (Original post by jimber)
I'm total opposite good luck!
you too, jimby
8. I'm officially scared, I decided to attempt a solomon paper because I've done all the past papers and seemed to be getting relatively okay marks, but I just failed that solomon paper where fail has never been before.
9. can someone post a really hard question involving range or domain, i can do ones with graphs that i can easily draw but when it asks for range of like x+3/2x+1, i cant draw the graph and dont know what it looks like.... can anyone give me some tips
10. (Original post by Get Cape.Wear Cape.Fly.)
Like June C2?
Lol, for some reason I found June C2 hard ;_;

I want 100 in C3 too. That would mean only 80% in C4. Muhahaha
11. (Original post by Doughboy)
Lol, for some reason I found June C2 hard ;_;

I want 100 in C3 too. That would mean only 80% in C4. Muhahaha
No, I meant June C2 was crazy paper that tested math ability. It was crazy hard.
12. I think doing solomon papers doesn't work for everyone, there are two outcomes,

1) You are able to do the solomon papers quite well, and as a result feel in good spirit, feel confident, and less nervous about the actual exam, or

2) You struggle with questions, don't understand, and so lose confidence, self esteem, with in turn may cause a "I'm just going to fail this exam!" mentality which effects the actual exam, even though there isn't any reason to, because the edexcel exam will be much easier overall.
13. (Original post by indie_couture)
Question:

x = sec^y + tany

show d/dx = cos^2y/2tany +1

so
u = sec^2y
v= tany

u' = 2secy x secxtany
y' = sec^2y

= tany x 2secy x tanysecy + sec^2y x sec^2y

but the mark scheme has this?

2 sec y × sec y tan y + sec^2 y = sec^2 y(2 tan y + 1)

wher have i gone wrong?
What's the question? sec^y or sec^2y or sec^2 y?

Why are you using u and v? Just diff. both and add together...
14. (Original post by Get Cape.Wear Cape.Fly.)
What's the question? sec^y or sec^2y or sec^2 y?

Why are you using u and v?
sorry, its sec^2y
15. well dx/dy = 2(secy)(secytany) + tany
so dx/dy= 2sec^2 (y) tany + tany
take tan(y) as a common factor
oh well... I think something went wrong
perhaps the equation u wrote is WRONG :P
16. (Original post by indie_couture)
sorry, its sec^2y
do this:

question:
sec^2 y + tan y (right?)

so
2 sec(y) * sec(y)tan(y) + sec^2 y

factorising will give you sec^2 y (2tan(y) +1)

don't do u and v and whatever you're doing...i think you're using the product rule? don't...
17. this is going to be a disaster! I dont want to have to retake in june!
18. (Original post by TwirlGirl)
this is going to be a disaster! I dont want to have to retake in june!
Positive thoughts babe,
19. (Original post by MIKE ESSIEN IS QUITE SICK)
can someone post a really hard question involving range or domain, i can do ones with graphs that i can easily draw but when it asks for range of like x+3/2x+1, i cant draw the graph and dont know what it looks like.... can anyone give me some tips
when the questions ask these stuff, u simply use a rule, one rule --> DEnominators must not equal to zero so in this case 2x+1 must not equal to zero so x must not equal to -1/2 so x=-1/2 is an asymptote
this is the DOMAIN
to find the range, just find the inverse of the function, and use the same rule. Simple as that.

ok not that simple maybe
I feel I'm gonna mess up tomorrow. I really feel extremely nervous
20. (Original post by Get Cape.Wear Cape.Fly.)
do this:

question:
sec^2 y + tan y (right?)

so
2 sec(y) * sec(y)tan(y) + sec^2 y

factorising will give you sec^2 y (2tan(y) +1)

don't do u and v and whatever you're doing...i think you're using the product rule? don't...
oh i see, thanks xxx

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