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Edexcel A2 C4 Mathematics June 2015 - Official Thread

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soo nervous for thissssss
Original post by Jimmy_M
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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 !!
Original post by candol
Are we talking vectors?
eg OB = OA + 2AX


For example Q 6 part d on June 2013 Paper R
Original post by TeeEm
here it comes


Do you happen to have the mark scheme for it too?
Thoughts on tabular integration? Much quicker method if you need to use by parts more than once

can someone please help on 8b june 2015 IAL paper how do i integrate 1/sin4y
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?
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
Original post by TeeEm
too late now ... all recognition can be done by substitution
make sure you can substitute


:smile: do you think the paper would be harder this year?
Original post by Maham88
can someone please help on 8b june 2015 IAL paper how do i integrate 1/sin4y


cosec4y=-1/4ln(cosec4y+cot4y) +c
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)
Can someone help with part ii

I know that a.b=|a||b| when two lines are parallel but I have too many unknowns
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
Original post by frozo123
cosec4y=-1/4ln(cosec4y+cot4y) +c


thats what i did but are they doing here page 9 https://a48aca6bcd82b5ada594d7397b730e907e9902c3.googledrive.com/host/0B1ZiqBksUHNYdUJldmdCUllHZ2M/Edexcel%20C34%20-%20June%202015%20%28IAL%29%20Model%20Answers%20by%20koli248.pdf
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 image.jpg
i just feel like I'm going to fail. Why did I pick maths :banghead:
As long as there isn't a really big difficult vectors question I'll be fine :smile:
Original post by Maham88


Look at part a of that question... It literally gives you it
Original post by Maham88


I think they converted it to 2cos2ysin2y then used factor formulae
Original post by frozo123
I think they converted it to 2cos2ysin2y then used factor formulae


No they just looked at part a since it gives you it there

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