# Edexcel A2 C3 Mathematics 12th June 2015Watch

This discussion is closed.
3 years ago
#1801
(Original post by anndz3007)
-ln11/20=-(ln11-ln20)=ln20-ln11=ln20/11
Thanks.
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3 years ago
#1802
(Original post by rache11ouise)
well I was okay until I looked at June 2013 paper
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3 years ago
#1803
(Original post by nayilgervinho)
Predictions for 90 ums.
100 ums - 74
90 ums - 67
A - 61
B - 54
C - 47
D - 40
E - 31

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3 years ago
#1804
(Original post by suyoof123)
Thank you! cant believe I missed that....
happens ...
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3 years ago
#1805
QUESTION 7- struggling with C
Anyone able to help??
I think its quite straightforward just not getting it
https://07a69ccf283966549a9350d1a669...%20Edexcel.pdf

EDIT - Done it now, dont know how I didnt see it
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3 years ago
#1806
(Original post by nayilgervinho)
Predictions for 90 ums.
One would think that the difficulty of a paper can only be assessed once the paper has actually been seen.
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3 years ago
#1807

Near the end he has 4 solutions,

wouldnt 360 also be a solution as they want a range 0 - 360 and precisely at 360, x = 0 ?
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3 years ago
#1808
(Original post by nbofni)
But how do you solve the quadratic?

I got x^2(a) +x(k) +a = 0

How would you solve a quadratic like this???
I just did it and you don't need to go that route. It tells you that g(x) is a tangent to P and cuts it at Q; you can find out the gradient at P and therefore draw g(x) on the graph which will start you off
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3 years ago
#1809
(Original post by TeeEm)
happens ...
Those '.......'

can paint a thousand pictures ^^ , i doubt its good
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3 years ago
#1810
When its Rcos(x-alpha)

Do we work out alpha the same as Rcos(x+alpha)

I swear in the morning I thought we flip for minus, but now just done an example lost 6 accuracy marks FFS

pls someone help me out
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3 years ago
#1811
(Original post by humayra.ac)
Why has 3sinx from the question changed to 3cosx, how did they get to this stage ?? the model answer matches the mark scheme
it is being differentiated so 3sinx differentiated becomes 3cosx
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3 years ago
#1812
(Original post by Egg1)
Do we need to know-

- Half angle formula
- factor formula
- Proving double angle formula

?
I have done most of the c3 papers and to my knowledge factor formulae has never come up (I might be wrong though so dont hold me to that)
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3 years ago
#1813
(Original post by suyoof123)

Near the end he has 4 solutions,

wouldnt 360 also be a solution as they want a range 0 - 360 and precisely at 360, x = 0 ?
It's more than or equal to 0, but only less than 360. Not less than or equal to 360.
0
3 years ago
#1814
(Original post by ThePrestigeUK)
When its Rcos(x-alpha)

Do we work out alpha the same as Rcos(x+alpha)

I swear in the morning I thought we flip for minus, but now just done an example lost 6 accuracy marks FFS

pls someone help me out
alpha is tan^-1 B/A
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3 years ago
#1815
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3 years ago
#1816
Do we need to know any proofs
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3 years ago
#1817
no because it is less than 360 not equal to, (there is no line under the less sign)

(Original post by suyoof123)

Near the end he has 4 solutions,

wouldnt 360 also be a solution as they want a range 0 - 360 and precisely at 360, x = 0 ?
0
3 years ago
#1818
(Original post by MrBowcat)
It's more than or equal to 0, but only less than 360. Not less than or equal to 360.
Cannot believe I also missed that.,,,,,,,,,,,,,

Thank you kind sir for making that clear.
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3 years ago
#1819
Can anyone recommend any hard trig questions involving negative trig/angles?

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3 years ago
#1820
June 2014 R paper is disgusting
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