# Edexcel A2 C3 Mathematics 12th June 2015Watch

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3 years ago
#3681
(Original post by physicsmaths)
Dummy varibale x=-u?

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are you asking me or are you telling me?
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3 years ago
#3682
(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.

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3 years ago
#3683
(Original post by physicsmaths)
Telling, well that is a good way to do it aswell. End up 1/cos2(x) or something.

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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
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3 years ago
#3684
(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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3 years ago
#3685
(Original post by physicsmaths)
U gota admit the x=-u dummy varibale is nice tho.....

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it is a Warwick thing ...
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3 years ago
#3686
(Original post by TeeEm)
it is a Warwick thing ...
Y u taking the mick out of my dream uni .....

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3 years ago
#3687
(Original post by physicsmaths)
Y u taking the mick out of my dream uni .....

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..
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3 years ago
#3688
(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?
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3 years ago
#3689
.aa
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3 years ago
#3690
I think I got between 70-73 / 75 in this paper, what UMS am I looking at?
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3 years ago
#3691
For 7b) if you only calculated x to be 1/2 and 2 how many marks would you loose? 2 or 3?

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#3692
(Original post by LukeTownsend123)
I think I got between 70-73 / 75 in this paper, what UMS am I looking at?
100 most likely.
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3 years ago
#3693
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?
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3 years ago
#3694
Here is a link to the Edexcel Maths Summer 2015 Question Papers and Mark Schemes

2
3 years ago
#3695
TeeEm can you help me with C3 June 2015 question 4 part B please
I dont get how lambda simplifies to 1/40ln2

1
3 years ago
#3696
(Original post by imran_)
TeeEm can you help me with C3 June 2015 question 4 part B please
I dont get how lambda simplifies to 1/40ln2

I would love to but I am teaching until 20.00 tonight
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3 years ago
#3697
(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 :-)
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3 years ago
#3698
(Original post by imran_)
TeeEm can you help me with C3 June 2015 question 4 part B please
I dont get how lambda simplifies to 1/40ln2

Which bit?

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

Is that the bit?
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3 years ago
#3699
(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
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3 years ago
#3700
(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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