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# Edexcel A2 C4 Mathematics June 2015 - Official Thread Watch

1. (Original post by sj97)
Sorry, last minute question:
https://a086a5a2f39bda93734c56a63fab...%20Edexcel.pdf
THen how do you integrate the cosec^2 2x bit?
integrate cosec^2 x is a standard result on the c3 differentiation formula sheet
2. (Original post by studentwiz)
how do you recognise intergration, can someone explain method of recognition for intergration
too late now ... all recognition can be done by substitution
make sure you can substitute
3. soo nervous for thissssss
4. (Original post by Jimmy_M)
Attachment 429549

How would you solve e? I did it as two separate triangles, one with acute angle 77, the other with obtuse angle 102, but the mark scheme has it as the acute angled triangle multiplied by two?? AX is 2rt6, angles 77.16 and 102.84
same thing!!
sin 77.16 = sin 102.84 !!
5. (Original post by candol)
Are we talking vectors?
eg OB = OA + 2AX
For example Q 6 part d on June 2013 Paper R
6. (Original post by TeeEm)
here it comes
Do you happen to have the mark scheme for it too?
7. Thoughts on tabular integration? Much quicker method if you need to use by parts more than once

9. Hi, do I need to know the volume of a cone and volume of a sphere formulae for connected rate of change questions, or will it always be given?
10. (Original post by Ocean3)
For example Q 6 part d on June 2013 Paper R
OB' = OB + 2BA i think without having done the question
11. (Original post by TeeEm)
too late now ... all recognition can be done by substitution
make sure you can substitute
do you think the paper would be harder this year?
12. (Original post by Maham88)
cosec4y=-1/4ln(cosec4y+cot4y) +c
13. (Original post by Ripper Phoenix)
Even if you had to integrate try integration by substitution

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It would be wayyy easier to intergrate by partial fractions

(x)/(x+1) would become 1 - 1/(x+1) which would intergrate to x - ln(x+1)
14. Can someone help with part ii

I know that a.b=|a||b| when two lines are parallel but I have too many unknowns
15. (Original post by Mathsyy)
Hi, do I need to know the volume of a cone and volume of a sphere formulae for connected rate of change questions, or will it always be given?
it's better if you know it
I think there are some formulas on the formula booklet on the c1 page..

but it's better if you know it just to be sure
sphere volume = 4/3 pi r^3
Area of a sphere = 4 pi r^2
Area pyramid/cone= pi r h/3
cylinder area = pi r^2 h
16. (Original post by frozo123)
cosec4y=-1/4ln(cosec4y+cot4y) +c
thats what i did but are they doing here page 9 https://a48aca6bcd82b5ada594d7397b73...%20koli248.pdf
17. Can someone help me on part iiI know that when two lines are parallel a.b=|a||b| but then I have too many unknowns
18. i just feel like I'm going to fail. Why did I pick maths
19. As long as there isn't a really big difficult vectors question I'll be fine
20. (Original post by Maham88)
thats what i did but are they doing here page 9 https://a48aca6bcd82b5ada594d7397b73...%20koli248.pdf
Look at part a of that question... It literally gives you it

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