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# Edexcel A2 C4 Mathematics June 2016 - Official Thread watch

1. (Original post by GeologyMaths)
Thanks for the explanation but where is t in the question?
Sorry, I didn't look at your question properly, I used the wrong variables, let me fix it.
2. (Original post by Zacken)
Sorry, I didn't look at your question properly, I used the wrong variables, let me fix it.
Nice thanks
3. (Original post by GeologyMaths)
Nice thanks
Okay, should be fixed.
4. (Original post by GeologyMaths)
Someone help with part aAttachment 512309

I understand the whole pi y^2 dx thing, but cannot integrate it into a parametric equation question :/...

Which paper is that Q from, out of interest?
5. (Original post by Dohaeris)
Which paper is that Q from, out of interest?
https://a086a5a2f39bda93734c56a63fab...%20Edexcel.pdf
6. How did you know?
7. (Original post by GeologyMaths)
How did you know?
Googled it; did my edited explanation help?
8. (Original post by Zacken)
Googled it; did my edited explanation help?
Yeah thanks v much
9. (Original post by GeologyMaths)
Yeah thanks v much
Awesome.
10. https://e1934e482e1b0d2c8580c3a986eb...EZ3UTQ/CH4.pdf

For question 11, couldn't x coordinate also be 3pi/2 how are you supposed to figure out which specific value it is..

thnx
11. (Original post by Mihael_Keehl)
https://e1934e482e1b0d2c8580c3a986eb...EZ3UTQ/CH4.pdf

For question 11, couldn't x coordinate also be 3pi/2 how are you supposed to figure out which specific value it is..

thnx
From the graph, it's the first time y=0, besides for when t=0.
12. (Original post by Mihael_Keehl)
https://e1934e482e1b0d2c8580c3a986eb...EZ3UTQ/CH4.pdf

For question 11, couldn't x coordinate also be 3pi/2 how are you supposed to figure out which specific value it is..

thnx
I would say because it is the first intersection after the origin it has to be the smallest positive value of t
13. (Original post by EricPiphany)
From the graph, it's the first time y=0, besides for when t=0.
(Original post by Student403)
I would say because it is the first intersection after the origin it has to be the smallest positive value of t
lmao ofc omg
14. https://e1934e482e1b0d2c8580c3a986eb...EZ3UTQ/CH4.pdf

Page 48 Part d

After finding the t values, I am struggling to know what to do. pls give me a hint?
15. (Original post by Mihael_Keehl)
https://e1934e482e1b0d2c8580c3a986eb...EZ3UTQ/CH4.pdf

Page 48 Part d

After finding the t values, I am struggling to know what to do. pls give me a hint?
Plug it into your parametric equation and get values for (x, y)
16. (Original post by Zacken)
Plug it into your parametric equation and get values for (x, y)
Thank You.
17. Thanks
18. (Original post by Dohaeris)
Thanks
(Original post by Zacken)
Plug it into your parametric equation and get values for (x, y)
How do you do 8b of that question?
19. I don't suppose you know why that paper is 'withdrawn'? It's not any of the official papers on the edexcel website...
20. (Original post by Dohaeris)
I don't suppose you know why that paper is 'withdrawn'? It's not any of the official papers on the edexcel website...
There was some controversy over the 2013 A2 Maths papers. I can't remember exactly what happened, by I think there was a leak or a large shipment of papers were lost. I think it was the latter.

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