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# Edexcel A2 C4 Mathematics June 2015 - Official Thread watch

1. (Original post by Hudl)
Why doesn't this work

Attachment 426985

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Click on edit and preview post to open up that separate page where you can just edit your post, and scroll down and you should be able to remove the other attachment.
2. (Original post by rayquaza17)

Click on edit and preview post to open up that separate page where you can just edit your post, and scroll down and you should be able to remove the other attachment.
Thanks, didn't know that wasn't allowed, I e them separately.

Thanks
3. (Original post by Hudl)
Thanks, didn't know that wasn't allowed, I e them separately.

Thanks
No problem.

(Original post by Computing7788)
Can someone pls explain how to differentiate 3^x-1 ??
Do you mean or ?
4. (Original post by rayquaza17)
No problem.

Do you mean or ?
5. (Original post by Computing7788)
So you normally start off by writing then taking logs to get . Then you need to do implicit differentiation. Can you do it from here?
6. (Original post by rayquaza17)
So you normally start off by writing then taking logs to get . Then you need to do implicit differentiation. Can you do it from here?
I understand what you have done but there are more terms in the question though, it's question 2 from the June 2013 (R) paper, therefore wouldn't I have too log all the other terms or something
7. (Original post by Computing7788)
I understand what you have done but there are more terms in the question though, it's question 2 from the June 2013 (R) paper, therefore wouldn't I have too log all the other terms or something
Ooo this was the exam I actually sat.

Yes there are more terms, but you can just do the differentiation term by term.
So differentiate , , , and separately then add the differentiated terms all together again at the end.
8. In the trapezium rule, is 'n' the number of strips?
9. (Original post by Computing7788)
A nice trick is to write that as:

Bring the power down in the log:

Then differentiate exponentials as normal with ln(3) being the constant
10. can someone help me with june 13 replacement paper. Q4b ? i understand what they done in the mark scheme, but why couldn't i have taken out (10,000)^1/3 as this would lead me to still getting x=0.81 and that is still valid ? as x is less than 8/9? i tried this way and multiplied (10,000)^1/3 at end to the expansion too but dont get the same answer, get something like 24... ? pls can someone help, this is driving me crazy! many thanks
11. How would you integrate 2 / cos(2y) + 1
With respect to y.
Thanks

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12. (Original post by Moniii16081997)
How would you integrate 2 / cos(2y) + 1
With respect to y.
Thanks

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Is that:

or ?
13. (Original post by usycool1)
Is that:

or ?
The first one

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14. (Original post by Moniii16081997)
The first one

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Use the double angle formula for cos2y
15. (Original post by Moniii16081997)
The first one

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Ok - use the double angle formula for cos2y to rewrite it (use cos y instead of sin y). Then see if you can go on from there.
16. I am really panicking for C4, any advice?
17. (Original post by usycool1)
Ok - use the double angle formula for cos2y to rewrite it (use cos y instead of sin y). Then see if you can go on from there.
But I don't think you can integrate
cos^2 (y)

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18. (Original post by Joseph.S)
I am really panicking for C4, any advice?
Bump I'm terrible at C4 (struggling with bronze papers atm) but I need an A from this :L
19. (Original post by Moniii16081997)
But I don't think you can integrate
cos^2 (y)
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Can you not just make is (cosy)^2 and then integrate ?
20. (Original post by Artfanatic)
Can you not just make is (cosy)^2 and then integrate ?
I don't think you can do that, that only works when you differentiate.

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