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# Edexcel A2 C4 Mathematics June 2016 - Official Thread watch

1. (Original post by boyyo)
Does anybody have the excel ums converter for 2015. The one I have only goes up to summer 2014
2. (Original post by Zacken)
Ahh cool thanks bro. Will it be updated on the day the grade boundaries come out??
3. (Original post by boyyo)
Ahh cool thanks bro. Will it be updated on the day the grade boundaries come out??
Yeah.
4. (Original post by Azzer11)
I'm getting 90+ UMS in C3 and C4 but around 50UMS in M1, kill me now.
don't panic, start looking at the m1 topics and start posting questions to explain topics you don't understand
5. Can you integrate 1/(2x^2+1) using c34 techniques?
Can you integrate 1/(2x^2+1) using c34 techniques?
Yeh use the sub x=tanu/(sqrt2)

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7. (Original post by physicsmaths)
Yeh use the sub x=tanu/(sqrt2)

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How did you work that out aha
How did you work that out aha
terence tao is my best friend
How did you work that out aha
2x^2 = (root (2)x)^2

If we let t = root (2)x the integral becomes

(t^2 + 1)^-1

which we can do by u substitution with tan (u) = t = root (2)x

Sorry for stealing your glory physicsmaths
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10. (Original post by Euclidean)
2x^2 = (root (2)x)^2

If we let t = root (2)x the integral becomes

(t^2 + 1)^-1

which we can do by u substitution with tan (u) = t = root (2)x

Sorry for stealing your glory physicsmaths
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a cambridge boys like us dont need that working out.
only oxford boys do that much working out to to figure that sub out
beefting
11. (Original post by physicsmaths)
a cambridge boys like us dont need that working out.
only oxford boys do that much working out to to figure that sub out
beefting
No working out means you fudged the solution m8

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12. Ive been doing good in C3, but not so good in C4. Ive been losing most of my marks in the implicit differentiation and rates questions. Ive done a lot of questions, and feel relatively comfortable doing them, its just recognising that a question requires implicit differentiation that Im having trouble with. Can anyone suggest a way to identify this? I know there are some pretty obvious types, im referring to the ones that are less so like this one: What I did is think it was a connected rates of change question, and tried to figure out dh/dt by splitting it into dh/dv and dv/dt and then going on from there...
13. (Original post by lordoftheties)
Ive been doing good in C3, but not so good in C4. Ive been losing most of my marks in the implicit differentiation and rates questions. Ive done a lot of questions, and feel relatively comfortable doing them, its just recognising that a question requires implicit differentiation that Im having trouble with. Can anyone suggest a way to identify this? I know there are some pretty obvious types, im referring to the ones that are less so like this one: What I did is think it was a connected rates of change question, and tried to figure out dh/dt by splitting it into dh/dv and dv/dt and then going on from there...
That question you would do by separation of variables. You can tell that you need to do that because it says dh/dt, so the rate at which height changes with respect to time, but you don't have t as a variable anywhere in the equation. Hopefully I've made sense?
14. (Original post by pineneedles)
That question you would do by separation of variables. You can tell that you need to do that because it says dh/dt, so the rate at which height changes with respect to time, but you don't have t as a variable anywhere in the equation. Hopefully I've made sense?
Yh thats what I though too, but no, this is what you're supposed to do:

15. (Original post by lordoftheties)
Yh thats what I though too, but no, this is what you're supposed to do:

You can express the volume of the water remaining in terms of h

Hence you can also represent the rate of change of the volume in terms of h (first derivative of volume)

You already know the rate of change of the volume from the question so you can equate them

Clue I think is to notice you're given a rate of change of volume so you need to express h in terms of that rate of change
16. (Original post by lordoftheties)
Ive been doing good in C3, but not so good in C4. Ive been losing most of my marks in the implicit differentiation and rates questions. Ive done a lot of questions, and feel relatively comfortable doing them, its just recognising that a question requires implicit differentiation that Im having trouble with. Can anyone suggest a way to identify this? I know there are some pretty obvious types, im referring to the ones that are less so like this one: What I did is think it was a connected rates of change question, and tried to figure out dh/dt by splitting it into dh/dv and dv/dt and then going on from there...
what past paper year is this? I can remember doing it a while ago ... I just fancy doing that past paper year again haven't done it in ages.
17. (Original post by XxKingSniprxX)
what past paper year is this? I can remember doing it a while ago ... I just fancy doing that past paper year again haven't done it in ages.
June 2010
18. When you approach later parts of a vectors question...

19. (Original post by lordoftheties)
Ive been doing good in C3, but not so good in C4. Ive been losing most of my marks in the implicit differentiation and rates questions. Ive done a lot of questions, and feel relatively comfortable doing them, its just recognising that a question requires implicit differentiation that Im having trouble with. Can anyone suggest a way to identify this? I know there are some pretty obvious types, im referring to the ones that are less so like this one: What I did is think it was a connected rates of change question, and tried to figure out dh/dt by splitting it into dh/dv and dv/dt and then going on from there...
Think of dv/dt = rate in - rate out
20. (Original post by lordoftheties)
Ive been doing good in C3, but not so good in C4. Ive been losing most of my marks in the implicit differentiation and rates questions. Ive done a lot of questions, and feel relatively comfortable doing them, its just recognising that a question requires implicit differentiation that Im having trouble with. Can anyone suggest a way to identify this? I know there are some pretty obvious types, im referring to the ones that are less so like this one: What I did is think it was a connected rates of change question, and tried to figure out dh/dt by splitting it into dh/dv and dv/dt and then going on from there...
for implicit. just look at the equation given and if it has both x's and y's you gotta implicit.

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