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# Edexcel C3,C4 June 2013 Thread watch

1. (Original post by Myocardium)
How would you integrate something like 3^x?
Do you know how to differentiate it?
2. (Original post by justinawe)
I think it would be pretty standard, though I'm not 100% sure about that.

You could also easily integrate it using a substitution like u=x+1, btw.
I used substitution and got this , it's wrong!

What did I do wrong ?? Help ??

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3. (Original post by m4ths/maths247)
You are welcome.
All the best for tomorrow and stay positive!
Hey what did I do wrong with this question!! Help !!

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4. (Original post by MasterYi)
I have this which my teacher made. Has all the important ones.Attachment 227717
Thanks a bundle!
5. (Original post by PythianLegume)
Do you know how to differentiate it?
Yes, it'd be 3^xln(3)?
6. (Original post by orange94)
I used substitution and got this , it's wrong!

What did I do wrong ?? Help ??

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That's correct, actually.

Just in this case, you got 1+C instead of C. But when you really think about it, 1+C is still a constant anyway, so it doesn't matter.
7. (Original post by PhoenixSeeker)
Can someone please explain why I can't integrate 3/cos x ^2 like this..?
I understand the mark scheme and realise it is ALOT easier using that method (I just stupidly didn't spot sec x ^2)

Attachment 227714
You've integrated it wrong - it looks more like differentiation there.
8. (Original post by LegendX)
I want to believe that it will be a good paper, I really do but I'm afraid edexcel is gunna pull another c3 on us I mean, it is edexcel we're talking about...
The more you consume the mind with negativity the less time you have to relax and get familiar with the things that could make the difference.
Nobody knows what the paper will be like.
Everybody knows what they can do to be in the best position they can be come 9am tomorrow morning.

I think forums are great for sharing knowledge and study help but I don't believe any forum is ideal if the vibe is a defeatist one especialy the night before an exam.

Heck it seems some people have already made their Hitler video on speculation alone.

You can only do what you have prepped for. If you have put 100% effort in then nobody can ever say you didnt give it your best.
If the paper is easy, if the paper is hard, if the paper is in the middle, one thing remains.....A positive student will do better on that paper than one that goes in with doubt.

Good luck for tomorrow.
9. (Original post by justinawe)
I'd use

specifically in this case A=x/2, so:

thnx but I don't understand why you use half angle isn't the question: i'm really confused
10. (Original post by Lolc4)
Thanks a bundle!
Lol these are all in the formula book wtf

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11. (Original post by Myocardium)
Yes, it'd be 3^xln(3)?
Hence integrating 3^x leads to division by ln(3).
12. (Original post by Myocardium)
How would you integrate something like 3^x?
13. (Original post by ACBLISS)
can soomeone give me the shapes we need to know, i/e their formulas for C4
Is it just cylinder,cone,sphere and maybe prism?
http://4.bp.blogspot.com/-E7F2lQoZQy...600/volume.jpg

14. can ANYONE please help me solve this equation to get it in terms of V, as I have put at the side can't do it at all
15. (Original post by orange94)
I used substitution and got this , it's wrong!

What did I do wrong ?? Help ??

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u forgot to find du/dx and sub that in
16. please guys i want help with the question 7 c) in the paper of January 2013...
17. (Original post by orange94)
Lol these are all in the formula book wtf

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Other than the ones which aren't in there, but you could easily rearrange them or learn them.
thnx but I don't understand why you use half angle isn't the question: i'm really confused
The half angle is because you have cos x
So to be able to use the double angle formulae, x must be x/2
so cos2(x/2) = cos x
thnx but I don't understand why you use half angle isn't the question: i'm really confused
You want to get rid of the square root, so you need it in terms of something squared.

20. (Original post by sonyeric33)
u forgot to find du/dx and sub that in
I thought this, but luckily du=dx in this case.

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