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# Edexcel A2 C4 Mathematics June 2016 - Official Thread watch

1. (Original post by HoldtheDoor)
Q8, wasn't it costheta= -4/5?
This really confused me. Initially I got 4/5, but then I realised I had used AP instead of PA so I calculated it again and got -4/5. If you do costheta = -4/5 and then 180-theta to get the angle in the negative sin quadrant, you get the correct acute angle. I didn't have time to change my answer though, and still can't tell which one is right
2. (Original post by M3WIZARD)
Im pretty sure that will only lose us 1 Accuracy mark if that's the case anyway But we've probably just forgot :P We could still get 100 UMS if we were wrong still.
I think it's not correct tho.. isn't it 3 x 4 x -5 x (5/2)^3 x 1/6?
3. How many marks would I lose if i got the volume as 1024 pi/5
4. how much was the volume worth?
5. I dropped at least 3 marks on the last part of the last question, and I also got my dy/dx and therefore the exact coordinate wrong somehow :s! I got 3(pi) + 47 / (pi) + 18 but I am pretty sure there'll be error carried forward marks so it's all good
6. (Original post by EastGuava)
This really confused me. Initially I got 4/5, but then I realised I had used AP instead of PA so I calculated it again and got -4/5. If you do costheta = -4/5 and then 180-theta to get the angle in the negative sin quadrant, you get the correct acute angle. I didn't have time to change my answer though, and still can't tell which one is right
+0.8 is right because minus give you the obtuse initially I got -0.8 but I changed it and made a note

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7. Also what was the minutes from the differential equation.
8. How many marks were 4, 6 and 7??
9. (Original post by M3WIZARD)
Im pretty sure that will only lose us 1 Accuracy mark if that's the case anyway But we've probably just forgot :P We could still get 100 UMS if we were wrong still.
yeah no I think I did have that in the end actually, cos what I was thinking of was the expansion prior to timesing through by 1/8
10. If i didn't simplify cos for the last q how many marks will I lose and many marks was the area q
11. (Original post by k.russell)
I think it's not correct tho.. isn't it 3 x 4 x -5 x (5/2)^3 x 1/6?
It was then timesed by 1/8 because of the brackets on the outside - I MAY have possibly forgot, IDK. Even still - that's only 1M - considering how hard people found the paper, that'll mean you still get 100 ums
12. (Original post by EastGuava)
This really confused me. Initially I got 4/5, but then I realised I had used AP instead of PA so I calculated it again and got -4/5. If you do costheta = -4/5 and then 180-theta to get the angle in the negative sin quadrant, you get the correct acute angle. I didn't have time to change my answer though, and still can't tell which one is right
Yes, your more likley correct, stupid me forgot to take it away from 180...
[EDIT] Wait so did you make the same mistake as me by not taking away from 180?
13. for the differential equation i left it in terms of lns i didnt do e to the power of blah blah blah , how many many marks do you think ill lose???//
14. for differential equation question did anyone get lnx on one side and like 4/5t or somethin on the other side?????
15. (Original post by M3WIZARD)
It was then timesed by 1/8 because of the brackets on the outside - I MAY have possibly forgot, IDK. Even still - that's only 1M - considering how hard people found the paper, that'll mean you still get 100 ums
yeah I think I am getting the original value and the x1/8 values mixed up in my head, it's the first question so little far back in my memory. I definitely timesed the expansion by 1/8, so would be a blinding error not to do the last term
16. If you're talking about 75 marks then that is a stupid question....
17. For the volume, how many mark would I lose if I stupidly misquoted my answer from (i) as ((2x-1)^3/2)/5 rather than ((2x-1)^5/2)/5? (So I obviously lost the accuracy mark and another one for the integration, but I got the limits and everything rlse correct).
Also do you reckon boundaries will be similar to last year? Probably slightly higher?

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