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# Edexcel A2 C4 Mathematics June 2015 - Official Thread watch

1. (Original post by tiny hobbit)
There aren't any R papers this year.
Oh really? so I had finished before you guys started the exam.
2. (Original post by bannakox)
is integrating a^x even on the spec?
Yes. It's a^x/ln(a)
it was in one of the past papers
3. was it 160ln3 pi for the integration without the cone?
4. (Original post by Emmi12345)
Yes that's what I got!
I spent 20 mins checking my whole paper at the end so I'm fairly confident with most of my answers.
5. On the last question, did you all remember to subtract the volume of the cone, too? I ended up with pi*(13 ln(3)-27)/ln(3) or something.
6. (Original post by Medicjug)
Did ANYONE. Get 12pi/ln3 for the last question please guys

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It was 13pi/ln3
http://www.thestudentroom.co.uk/show....php?t=3407637
8. (Original post by DomRauba)
was it 160ln3 pi for the integration without the cone?
should be 40pi/ln3
9. (Original post by phoenixsilver)
Quite an easy paper actually, I think the grade boundaries will be high.

Did anybody get 0.47 something for the time exceeding 4000, using radians mode on the calculator?
I got something like that, 0.473 maybe?
10. (Original post by Quackmatic)
On the last question, did you all remember to subtract the volume of the cone, too? I ended up with pi*(13 ln(3)-27)/ln(3) or something.
11. For the Cartesian equation, a=2 and b= -5? Setting out the proof was quite tricky
12. (Original post by talkbiology)
For the Cartesian equation, a=2 and b= -5? Setting out the proof was quite tricky
I got -25/2 or something

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13. (Original post by anndz3007)
for the ln2 question, did anyone get 32(ln2 square)-32ln2+12 ??
Yea buddy
14. (Original post by phoenixsilver)
Quite an easy paper actually, I think the grade boundaries will be high.

Did anybody get 0.47 something for the time exceeding 4000, using radians mode on the calculator?
I used radians because I'm 90% sure I read in the textbook somewhere that you can't use degrees with sin/cos/tan in calculus.

I'm pretty sure i got 0.3 something though and I'm confident it was right. Did you use P = 4 and not 4,000?
15. Is integrating 3^2x, 3^x/ln3 ?

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16. (Original post by talkbiology)
I got 31.82 for angle and something like 7.46 for the length, basically 10root2 times the sine of the angle
Yess some boy me class said he got 60 something, glad I'm not the only one who got 31.
17. Ugh got 27.1 years for P = 4000 or something, did it in degrees... is that just 1 mark gone or 2?
18. (Original post by Jasmine:)))))
should be 40pi/ln3
I got 80pi/ln3 for the area under the whole curve then either 67pi/ln3 or 57/piln3 can't remember
19. VOTE NOW ON HOW YOU FOUND THIS EXAM!
Note: C4 JUNE 2015 UK paper ONLY!

.
20. Was the ln2 area 32ln2 -12??

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