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# The Edexcel C4 (21/06/12 - PM) Revision Thread Tweet

Maths exam discussion - share revision tips in preparation for GCSE, A Level and other maths exams and discuss how they went afterwards.

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1. Re: The Edexcel C4 (21/06/12 - PM) Revision Thread
(Original post by This Honest)
How do you integrate (1+2x)^-2

I did it and got -(1+2x)^-1
you wouldn't multiply the -1 by 2 coz that's the chain rule
You have to use a special method.

Basically you add one to the power of your integral and differentiate

(1+2x)^-1 now differentiate this and see what number you get outside the bracket...

d/dx (1+2x)^-1

= -2(1+2x)^-2

now you need to multiply the number outside the bracket by another number to give you '1'

so we would have to multiply it by -1/2

so you would get

-1/2 (1+2x)^-1

It's worth remembering that integration is the opposite of differentiation.

If you see brackets with a power, when you integrate the expression, the power increases by 1.
Last edited by James A; 04-06-2012 at 14:02.
2. Re: The Edexcel C4 (21/06/12 - PM) Revision Thread
Grade boundary for A*(i.e. 90/100 UMS) had never higher than 72/75 for any maths module. In order to maximise your chances of getting an A*, you have to make sure you lose no more than 6 marks total in C3 and C4.
3. Re: The Edexcel C4 (21/06/12 - PM) Revision Thread
(Original post by James A)
You have to use a special method.

Basically you add one to the power of your integral and differentiate

(1+2x)^-1 now differentiate this and see what number you get outside the bracket...

d/dx (1+2x)^-1

= -2(1+2x)^-2

now you need to multiply the number outside the bracket by another number to give you '1'

so we would have to multiply it by -1/2

so you would get

-1/2 (1+2x)^-1

It's worth remembering that integration is the opposite of differentiation.

If you see brackets with a power, when you integrate the expression, the power increases by 1.

Yes yes yes
Cheers buddy!
4. Re: The Edexcel C4 (21/06/12 - PM) Revision Thread
(Original post by MustyQ)
how does cosec^2xtan^2x = sec^2x :s

Cosec(X) = 1/sin(X)

Tan (X) = Sin(X)/Cos(X)

=> Cosec(X) x Tan(X) = 1/cos(x) = Sec(X)

I left out the '^2' because it made the writing clumsy
5. Re: The Edexcel C4 (21/06/12 - PM) Revision Thread
(Original post by ezioaudi77)
Grade boundary for A*(i.e. 90/100 UMS) had never higher than 72/75 for any maths module. In order to maximise your chances of getting an A*, you have to make sure you lose no more than 6 marks total in C3 and C4.
fml i thought the most marks you could loose would be like 8 but dang, i need to be spotless.........
6. Re: The Edexcel C4 (21/06/12 - PM) Revision Thread
Hi everyone, here are booklets with past paper questions from Core 4 papers if you want to revise certain topics
Attached Files
7. Algebra.pdf (36.2 KB, 66 views)
8. Algebra SCHEME.pdf (76.8 KB, 43 views)
9. Binomial Series.pdf (58.1 KB, 189 views)
10. Binomial Series SCHEME.pdf (147.6 KB, 31 views)
11. Coordinate Geometry.pdf (121.0 KB, 557 views)
12. Coordinate Geometry SCHEME.pdf (210.7 KB, 41 views)
13. Differential Equations.pdf (73.4 KB, 221 views)
14. Differential Equations SCHEME.pdf (158.2 KB, 49 views)
15. Implicit Differentiation.pdf (40.3 KB, 164 views)
16. Implicit Differentiation SCHEME.pdf (121.5 KB, 36 views)
17. Re: The Edexcel C4 (21/06/12 - PM) Revision Thread
(Original post by shahruk)
Cosec(X) = 1/sin(X)

Tan (X) = Sin(X)/Cos(X)

=> Cosec(X) x Tan(X) = 1/cos(x) = Sec(X)

I left out the '^2' because it made the writing clumsy
cheeers pal i got there in the end but thanks
18. Re: The Edexcel C4 (21/06/12 - PM) Revision Thread
(Original post by browb003)
Hi everyone, here are booklets with past paper questions from Core 4 papers if you want to revise certain topics
2nd lot
Attached Files
19. Integration.pdf (247.9 KB, 220 views)
20. Integration SCHEME.pdf (400.0 KB, 49 views)
21. Vectors.pdf (96.7 KB, 298 views)
22. Vectors SCHEME.pdf (303.7 KB, 53 views)
23. Re: The Edexcel C4 (21/06/12 - PM) Revision Thread
(Original post by browb003)
Hi everyone, here are booklets with past paper questions from Core 4 papers if you want to revise certain topics
you are a sikk sikkk guyyyy!!!!! that means good btw
24. Re: The Edexcel C4 (21/06/12 - PM) Revision Thread
(Original post by browb003)
Hi everyone, here are booklets with past paper questions from Core 4 papers if you want to revise certain topics
Always wanted the questions chapter sorted, thanks for posting these. Rep given

Btw, do you have these for C3 as well?
25. Re: The Edexcel C4 (21/06/12 - PM) Revision Thread
(Original post by ezioaudi77)
Always wanted the questions chapter sorted, thanks for posting these. Rep given

Btw, do you have these for C3 as well?
Yup, I've posted them in this thread

http://www.thestudentroom.co.uk/show....php?t=1481747

Last edited by browb003; 04-06-2012 at 15:34.
26. Re: The Edexcel C4 (21/06/12 - PM) Revision Thread
(Original post by browb003)
2nd lot
Amazing, thanks! Time to try to understand vectors then!
27. Re: The Edexcel C4 (21/06/12 - PM) Revision Thread
(Original post by browb003)
Yup, I've posted them in this thread

http://www.thestudentroom.co.uk/show....php?t=1481747

Thank you
28. Re: The Edexcel C4 (21/06/12 - PM) Revision Thread
(Original post by browb003)
2nd lot
Thanks a lot

You don't by any chance have a list of all the trig identities?? Would be really helpful
29. Re: The Edexcel C4 (21/06/12 - PM) Revision Thread
(Original post by browb003)
Hi everyone, here are booklets with past paper questions from Core 4 papers if you want to revise certain topics
thank you so much
30. Re: The Edexcel C4 (21/06/12 - PM) Revision Thread
has anyone got the new edexcel c4 book..i need help on ex 6F question 3c
help would be really appreciated
31. Re: The Edexcel C4 (21/06/12 - PM) Revision Thread
I have a feeling that an integration questions will come up that will absolutely bullock me!
32. Re: The Edexcel C4 (21/06/12 - PM) Revision Thread
(Original post by master_blaster66)
has anyone got the new edexcel c4 book..i need help on ex 6F question 3c
help would be really appreciated
Here's the solution from the CD, I hope it's the same book ha.
What part are you stuck on?

33. Re: The Edexcel C4 (21/06/12 - PM) Revision Thread
(Original post by browb003)
Here's the solution from the CD, I hope it's the same book ha.
What part are you stuck on?

i got to the 5th line of this solution, but i dont know where you get the 2 from in the 6th line
34. Re: The Edexcel C4 (21/06/12 - PM) Revision Thread
(Original post by master_blaster66)
has anyone got the new edexcel c4 book..i need help on ex 6f question 3c
help would be really appreciated
cant you give the question
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