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# Edexcel A2 C4 Mathematics June 2015 - Official Thread Watch

1. Does anyone have a list of shapes we need to know the areas and volumes of? I'm not sure which shapes they give the formulae for in the exam and which they don't.
2. (Original post by Bendak)
Does anyone have a list of shapes we need to know the areas and volumes of? I'm not sure which shapes they give the formulae for in the exam and which they don't.
trapezium.......****ed me over on a paper
3. Can someone tell me why what I have done is wrong? I don't understand - it seems logically right in my head.

It's question 8(b) on the June 2013 C4 paper.

(Apart from the missing square on the 6)

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4. (Original post by kingaaran)
Can someone tell me why what I have done is wrong? I don't understand - it seems logically right in my head.

It's question 8(b) on the June 2013 C4 paper.

(Apart from the missing square on the 6)

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Well the =36 suddenly disappeared on the line when you /9. You did it all correct, except it should be 225-36, which is 189, then divided by 9 you get 21, meaning the answer is lamda = -3 or -7

Oh no I see, you did do the cancelling correctly. I got an equation same as yours excep =36.. I'm unsure how you got to that stage if I'm honest..
5. Boys, can we get a question asking to integrate cosx^3?

cheeeers
6. (Original post by bobabob)
Boys, can we get a question asking to integrate cosx^3?

cheeeers
Doubt it.
But cos3x=4cos^3(x)-3cosx so u can do it this way.

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7. (Original post by physicsmaths)
Recognition
integral of a^xlna is a^x so integral of a^x is a^x/lna

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Where did you actually learn this? As I've never seen it in my book, makes me worried there'll me more stuff like this theyll give us that I will have just never seen before haha

Also why does the integral of a^xlna = a^x ?
8. Can they ask you for the volume of revolution around the y axis and if so how do you do it?
9. (Original post by bobabob)
Boys, can we get a question asking to integrate cosx^3?

cheeeers
watch this
10. (Original post by Johann von Gauss)
Are you sure they would accept Weierstrauss substitution? I doubt its in the syllabus.
Yeah, as long as the examiner isn't an invalid
11. (Original post by Egg1)
Where did you actually learn this? As I've never seen it in my book, makes me worried there'll me more stuff like this theyll give us that I will have just never seen before haha

Also why does the integral of a^xlna = a^x ?
Express a^x in terms of e, use log laws, differentiate
12. (Original post by lukeisscared)
Can they ask you for the volume of revolution around the y axis and if so how do you do it?
no. the method any way is
13. (Original post by lukeisscared)
Can they ask you for the volume of revolution around the y axis and if so how do you do it?
nah their syllabus forbids them
14. (Original post by Egg1)
Where did you actually learn this? As I've never seen it in my book, makes me worried there'll me more stuff like this theyll give us that I will have just never seen before haha

Also why does the integral of a^xlna = a^x ?
The idea has come up before.
eg 2x differentiates to 2xln2.
that means if i am integrating (going the other way) 2x the answer must be something to do with 2x . It is just a matter of sorting out the constant.
So integrate 2x ln2 becomes 2x
therefore integrating 2x becomes 2x/ln2
15. (Original post by Gilo98)
no. the method any way is
That makes sense doesn't it, ok cool thanks
16. I am absolutely ******. What should I focus on? I can do binomial, partial fractions, and basic integration, and a lot of vectors.
17. (Original post by Boro12345)
I am absolutely ******. What should I focus on? I can do binomial, partial fractions, and basic integration, and a lot of vectors.
Differential equations.

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18. Any tips guys I've done all the real papers and all the Solomon and most IYGB but I feel like I've lost touch with c4. What can I do?

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19. (Original post by lukeisscared)
That makes sense doesn't it, ok cool thanks
yep, and then for parametrics make your substitution and rewrite limits in terms of
20. (Original post by Boro12345)
I am absolutely ******. What should I focus on? I can do binomial, partial fractions, and basic integration, and a lot of vectors.
The big marks will be in solving differential equations using integration probably. Try revising that

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