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# Edexcel A2 C4 Mathematics June 2015 - Official Thread watch

1. (Original post by sahlean)
You've integrated a trig expression so have to use radians.
Hmm. Annoying if you're correct. I plugged in my value again and 27.1 is correct. 0.46 wouldn't sound right if they wanted it years. I guess we'll wait for Arsey.
2. If i got about 55/75, what UMS do you reckon that would be?? I'm hoping it's over 70 UMS??
3. (Original post by ThatPerson2)
It would be radians because you used calculus to get it - degrees and calculus don't mix;

http://math.stackexchange.com/questi...ns-in-calculus
phew! I thought that was the norm so that's why I used it.

So... my answer is right then...?? (Come on arsey my man...)
4. (Original post by wrfrew)
guys is this spam or an actual thing?
Proper fing, mate
5. can i get an a overall with 2 mid level a's in C3 and S1 and a very high b here?
6. (Original post by 11234)
Help!!

How many marks would I lose for putting 32In2^2 + 32In2 -12 instead of 32In2^2 - 32In 2 +12
help!! Pls
7. (Original post by 11234)
Help!!

How many marks would I lose for putting 32In2^2 + 32In2 -12 instead of 32In2^2 - 32In 2 +12
a lot
8. (Original post by Joseph.S)
Hmm. Annoying if you're correct. I plugged in my value again and 27.1 is correct. 0.46 wouldn't sound right if they wanted it years. I guess we'll wait for Arsey.
27.1 when you use degrees
9. (Original post by Randomz96)
Hi people could someone answer this since I need an a* in maths for uni..... Basically up to the last question I dropped 4 marks then on 8b I differentiated 3^2x and stuck in the correct limits and did the rest correct but I'm thinking this is a big maths error, how many marks will I loose , the qu was out of 6. Thanks
10. (Original post by ThatPerson2)
It would be radians because you used calculus to get it - degrees and calculus don't mix;

http://math.stackexchange.com/questi...ns-in-calculus
That is not technically correct; as long as you carry the π/180, it is possible to use degrees.
11. Has arsey posted the answers yet? Can someone please post a link if he has I can't seem to find it
12. got around 64, damn, here's hoping the boundaries are nice
13. (Original post by sahlean)
it doesn't say anything about using degrees?
MY HEAD IS SPINNING RIGHT NOW

I saw one guy on about using degrees and getting 27.1 years, which made me doubt my own and then think well 0.4 is a weird answer.. now people are making me think I'm right again.

*fingers crossed come on arsey*
14. (Original post by DomRauba)
Did you use pi, and substract the volume of the cone?
15. (Original post by Joseph.S)
Hmm. Annoying if you're correct. I plugged in my value again and 27.1 is correct. 0.46 wouldn't sound right if they wanted it years. I guess we'll wait for Arsey.

I wrote both down just in case (checked them with the equation and both work). But he's right, calculus with trig ALWAYS uses radians (unless specifically stated), though apparently in past papers they have accepted both as an answer. You'd only lose up to one mark for using degrees.
16. (Original post by pepperonipizza)
Has arsey posted the answers yet? Can someone please post a link if he has I can't seem to find it
nope he hasn't been online yet :0
17. (Original post by xKay)
a lot
How many it was only a 3 marker
18. (Original post by thatNoseyParker)
MY HEAD IS SPINNING RIGHT NOW

I saw one guy on about using degrees and getting 27.1 years, which made me doubt my own and then think well 0.4 is a weird answer.. now people are making me think I'm right again.

*fingers crossed come on arsey*
If you use calculus then the angle has to be in radians so dw your answer is correct
19. Am I the only one who found C3 so much easier than C4?
20. (Original post by Randomz96)
Hi people could someone answer this since I need an a* in maths for uni..... Basically up to the last question I dropped 4 marks then on 8b I differentiated 3^2x and stuck in the correct limits and did the rest correct but I'm thinking this is a big maths error, how many marks will I loose , the qu was out of 6. Thanks
As long as the volume of the cone was correct, and the coordinate of Q was correct, meaning that everything else was correct, I assume that you could lose maximum three marks. I believe that 68 will still be an A*.

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