Edexcel A2 C3 Mathematics 12th June 2015 Watch

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lucief96
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#1481
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#1481
(Original post by TheAnnabelle)
Also, sorry to bug, is it 90 ums in each paper? Or 90 ums average against both papers?


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180 UMS in core 3 and 4 put together for an A*
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Gilo98
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#1482
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(Original post by shuff_joe)
You have to consider it as 1/cos not sec on its own, I understand your confusion but the sec graph has an indeterminable minimum y value

So treat sec as 1/cos
25/21×(1/cosx) (or whatever the fraction was)

Cos needs to be it's maximum for 1/cos to be the minimum, so cos(x) = 1

25/21 × (1/1)

25/21

I apologise if I got the fraction wrong, on phone and forgot what it was :P



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OK thank you, I'm just being stubborn really - I gave the positive answer in the mock as it was asking for speed
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Gome44
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(Original post by TheAnnabelle)
Is "proof by counter example" part of the spec? Is there a reason it crops up in the Soloman papers? It really makes me panic!


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I think it's been taken out the spec, Edexcel just haven't updated it (from what I hear)
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lucief96
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anyone come across any particularly hard past paper questions that would be worth seeing??
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Maham88
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#1485
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Does anyone have the jan 2015 IAL paper ?
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Jaz_ace
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#1486
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#1486
Any chance a June 2013 type of paper could come
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ridirahman
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#1487
Anyone know any hard papers that are worth doing?
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adorablegirl1202
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#1488
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#1488
(Original post by lucief96)
anyone come across any particularly hard past paper questions that would be worth seeing??
june 2013
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iKaneee
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#1489
(Original post by lucief96)
anyone come across any particularly hard past paper questions that would be worth seeing??
Try 2014 R paper, hardest one ive seen
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JayGreen
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(Original post by Maham88)
Does anyone have the jan 2015 IAL paper ?
have you checked on the physicsandmathstutor website?
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Nurishment
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#1491
(Original post by imedico10)
You need to use the other equation because x is now bigger than for. Sub in x=5 into e^(2x-8) -4
Oh my bad. I was trying to do it altogether at once. I understand now :P. Do f(0) first to get 5 and then f(5) and since x>4 this time around, you use the f(x) equation for when x>4. Thanks ^_^
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Maham88
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(Original post by JayGreen)
have you checked on the physicsandmathstutor website?
yeah i have they dont have it
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Prince97
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#1493
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#1493
(Original post by Maham88)
Does anyone have the jan 2015 IAL paper ?
Yes, use this link! https://drive.google.com/folderview?...JHS1ZSTHM#list
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Maham88
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#1494
thanks
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suyoof123
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https://www.youtube.com/watch?t=254&v=Dl9DOikeb0k

Was there a reason he went the long way for the second solution?

couldnt he left it 2(theta) = 5pie / 6

Also as original values were between 0 - pie , since its 2 theta you double the range.

then using the cast rule, add a pie to that first solution , 5pie/ 6 , for the 3rd quadrant solution

so you have 2(theta) = 5pie / 6 and 11pie/6

to find theta divide both by 2 and they are your answers.
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anonwinner
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#1496
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#1496
(Original post by iKaneee)
Try 2014 R paper, hardest one ive seen
Really? I just did it earlier and found it wayyyy easier than some other papers. Which questions do you think were hard?
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JayGreen
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(Original post by anonwinner)
dx/dy never gives the gradient
when using dx/dy if you sub in the y value and flip the answer that gives you the gradient
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SuperMushroom
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#1498
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#1498
(Original post by JayGreen)
when using dx/dy if you sub in the y value and flip the answer that gives you the gradient
Whats the reason for flipping? i thought if you do dx/dy and sub in the Y value then this gives you the gradient ?
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radhikagulati
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#1499
How do you work out max volumes and min volumes again (we learnt it in C2 but Ive forgotten and i can't find my notes anywhere!)
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Cosmi
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(Original post by SuperMushroom)
Whats the reason for flipping? i thought if you do dx/dy and sub in the Y value then this gives you the gradient ?
You need to find dy/dx.
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