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Edexcel A2 C3 Mathematics 12th June 2015

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Original post by physicsmaths
Dummy varibale x=-u?


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are you asking me or are you telling me?
Original post by TeeEm
are you asking me or are you telling me?


Telling, well that is a good way to do it aswell. End up 1/cos2(x) or something.
Im asking is this your way?


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Original post by physicsmaths
Telling, well that is a good way to do it aswell. End up 1/cos2(x) or something.
Im asking is this your way?


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no ...
I know 3 methods

multiply top and bottom by (1+sinx), simplify and split
little t identities/substitution
or trig identities and recognition
Original post by TeeEm
no ...
I know 3 methods

multiply top and bottom by (1+sinx), simplify and split
little t identities/substitution
or trig identities and recognition


U gota admit the x=-u dummy varibale is nice tho.....
Oh and after getting two expression for the integrand. Add them then integrate a nice expression(i do end up mutiplying by 1-sinx tho 😉) divide by 2.


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(edited 8 years ago)
Original post by physicsmaths
U gota admit the x=-u dummy varibale is nice tho.....


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it is a Warwick thing ...
Original post by TeeEm
it is a Warwick thing ...


Y u taking the mick out of my dream uni .....


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Original post by physicsmaths
Y u taking the mick out of my dream uni .....


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..
101.JPG33.6KB
Original post by Gome44
Was it? Which parts did you find hard (if you can remember)?


I don't remember. I was going for an A, and spent the entire week prior to M3 in no-life mode where all I did was work, eat, sleep and take short breaks. Then I go into that exam and I can't answer half the questions. It put me in such a **** mood after that I tried to exclude it from my mind so it doesn't screw up the rest of my exams.

Though, I remember there were two springs?
.aa
I think I got between 70-73 / 75 in this paper, what UMS am I looking at?
For 7b) if you only calculated x to be 1/2 and 2 how many marks would you loose? 2 or 3?

Someone please help! I'd be really grateful :smile:
(edited 8 years ago)
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Original post by LukeTownsend123
I think I got between 70-73 / 75 in this paper, what UMS am I looking at?


100 most likely.
For 7a) i did the proof in part b stupidly. Wasn't thinking straight. That means i'll lose all the marks for part a?
Here is a link to the Edexcel Maths Summer 2015 Question Papers and Mark Schemes

https://drive.google.com/folderview?id=0B3tgJoiYtxdOfkp0Q1EwT05XczdZcm0tMTZWZ25mN2NVcHNFZXdfSlVCeTk2NXNpeVBpaTA&usp=sharing
@TeeEm can you help me with C3 June 2015 question 4 part B please
I dont get how lambda simplifies to 1/40ln2

https://a48aca6bcd82b5ada594d7397b730e907e9902c3.googledrive.com/host/0B1ZiqBksUHNYdUJldmdCUllHZ2M/Edexcel%20C3%20-%20June%202015%20Model%20Answers%20by%20Arsey.pdf
Original post by imran_


I would love to but I am teaching until 20.00 tonight
Original post by TeeEm
I would love to but I am teaching until 20.00 tonight


Alright no worries, i'll ask you at a later time :-)
Original post by imran_


Which bit?

ln(1/2) = ln 1 - ln 2 = 0 - ln 2 = - ln 2

Is that the bit?
Original post by tiny hobbit
Which bit?

ln(1/2) = ln 1 - ln 2 = 0 - ln 2 = - ln 2

Is that the bit?

when simplifying I get ln0.5/-40

But its wrong I dont understand why
Original post by imran_
when simplifying I get ln0.5/-40

But its wrong I dont understand why


They wanted integers, so 0.5 won't do. Your answer is correct so far however.

Replace 0.5 with 1/2 then use my previous post.

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