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# Edexcel A2 C4 Mathematics June 2016 - Official Thread watch

1. (Original post by aymanzayedmannan)
Are you sure that it's with respect to x?
I meant with respect to y, sorry

(Original post by Zacken)
Assuming you mean then consider the substitution .
I've written and put it back in to the equation, but I can't seem to get further than .

(Original post by BBeyond)
You can do it by inspection if you mean dy: (2/3)sin^3(y) + c
I try to avoid inspection if I can, nearly always end up getting it wrong It's the right equation though, but thank you anyway!
2. (Original post by blackdiamond97)
I've written and put it back in to the equation, but I can't seem to get further than .
Surely that means you'd have ?

Since and
3. (Original post by Zacken)
Surely that means you'd have ?

Since and
C4 will be the death of me simply because I keep making silly mistakes I understand it from here, thank you
4. (Original post by blackdiamond97)
C4 will be the death of me simply because I keep making silly mistakes I understand it from here, thank you
You're welcome.
5. (Original post by blackdiamond97)
I meant with respect to y, sorry
I still recommend inspection as BBeyond said, but a sub will easily solve it too! You seem to be in good hands w/ Zacken, but if you want to do it by inspection, do consider .
6. Someone throw me a nice differential equation, quick
7. (Original post by Serine Soul)
Someone throw me a nice differential equation, quick
Terminal velocity equation? Mdv/dt =mg -kv . find velocity as a function of time
8. (Original post by Serine Soul)
Someone throw me a nice differential equation, quick
Use the substitution where is a function of to solve the DE:

that satisfied when in the form .
9. (Original post by samb1234)
Terminal velocity equation? Mdv/dt =g -kv . find velocity as a function of time
I don't do physics ;_;

Am I still supposed to be able to do it?
10. (Original post by Serine Soul)
I don't do physics ;_;

Am I still supposed to be able to do it?
Yeah its just that differential equation which is solvable via c4 methods. Assume that at time t=0, v=0.
11. (Original post by Serine Soul)
I don't do physics ;_;

Am I still supposed to be able to do it?
Check the edit, missed out an m
12. (Original post by samb1234)
Terminal velocity equation? Mdv/dt =mg -kv . find velocity as a function of time
Surely you mean lowecase m in front of the dv/dt as well?
13. (Original post by Serine Soul)
Someone throw me a nice differential equation, quick
Idk, probably a really easy one as I made it up, but

14. (Original post by Zacken)
Surely you mean lowecase m in front of the dv/dt as well?
Yeah im on my phone which corrected my grammar by making it a capital sorry
15. (Original post by BBeyond)
You can do it by inspection if you mean dy: (2/3)sin^3(y) + c
That was the first thing I thought aswell I.e integration by recognition when I saw that question. You get used to those type of questions.
16. (Original post by samb1234)
Yeah im on my phone which corrected my grammar by making it a capital sorry
Ah yeah that phone thing is always annoying
17. Cheers guys, I'm onto these now
18. (Original post by Serine Soul)
Cheers guys, I'm onto these now
I've got two follow ups to mine that builds on the concept introduced in this one.
19. (Original post by Zacken)
I've got two follow ups to mine that builds on the concept introduced in this one.
Y'all gonna have to wait a while

I blame walking over 4 miles today. It's slowed me down
20. (Original post by Serine Soul)
Y'all gonna have to wait a while

I blame walking over 4 miles today. It's slowed me down
Oh dear, take your time, savour the maths. No rush.

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