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# Edexcel A2 C4 Mathematics June 2015 - Official Thread watch

1. (Original post by bored565)
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?
I got 0.473 years!
2. (Original post by Beasttty)
lol you and your teachers are stupid
Don't think many people struggles around q 7 and 8
3. (Original post by DomRauba)
Guys, what was the x coordinate , i got 2- 1/ln3
I got ln(9) - 1/ln( 3)

And for the height of the cone . 1/ln(3
)
4. (Original post by Valkyrian)
I can't remember. I think I got something like root3/2 + 4pi/3 :/ don't know. Anyone else? Obviously we got something similar.

Hoping my mistakes were a minimal .. need around 97 UMS to counter my terrible c3 exam.
Yeah the substitution answer was root3/2 + 4pi/3
5. (Original post by talkbiology)
Rings a bell! for the volume of revolution I got 13pi / ln3, any confirmation?
You are correct my friend
6. Would the answer for years be in radians or degrees? Wouldn't it depend on the species of animal and how fast they reproduced
7. (Original post by pinksmartiee)
naah you probably didn't, many people got 32(ln2)^2 somethign something
Im pretty sure it was a quadratic in ln - 32(ln)^2 - 32ln2 + 12 maybe ?
8. I also got k as 4
And for the quadratic equation / (x-3) or something, I got a = 2 and b = -5
9. Did anyone else get 7.75 (think that was my answer) for the shortest length on the vector Q?
10. (Original post by DomRauba)
Guys, what was the x coordinate , i got 2- 1/ln3
i got this too
11. Barely had enough time to do Q9, I nearly missed it!
12. i'm kind of proud because i struggled a lot with vectors and actually felt i got that one right! but the rest of the paper was terrible.
13. (Original post by MelonKuma)
I also got k as 4
And for the quadratic equation / (x-3) or something, I got a = 2 and b = -5
K=2

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14. wasn't y=+-4
15. I got K as 2 - took 4 out of the equation as a factor, however it was still rooted giving 2 as the constant
16. VOTE NOW ON HOW YOU FOUND THIS EXAM!
Click here: http://www.thestudentroom.co.uk/show....php?t=3407487
Note: C4 JUNE 2015 UK paper ONLY!
17. (Original post by MelonKuma)
I got 31.8 degrees as the acute angle on the vector question and 7.46cm as the shortest distance from B to l1.
same!
18. (Original post by urz13)
I got K as 2 - took 4 out of the equation as a factor, however it was still rooted giving 2 as the constant
K is 2.

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19. (Original post by urz13)
Did anyone else get 7.75 (think that was my answer) for the shortest length on the vector Q?
Yep 👍
20. (Original post by talkbiology)
Rings a bell! for the volume of revolution I got 13pi / ln3, any confirmation?
Same

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