# Edexcel A2 C3 Mathematics 12th June 2015Watch

This discussion is closed.
3 years ago
#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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3 years ago
#1482
(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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3 years ago
#1483
(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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3 years ago
#1484
anyone come across any particularly hard past paper questions that would be worth seeing??
1
3 years ago
#1485
Does anyone have the jan 2015 IAL paper ?
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3 years ago
#1486
Any chance a June 2013 type of paper could come
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3 years ago
#1487
Anyone know any hard papers that are worth doing?
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3 years ago
#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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3 years ago
#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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3 years ago
#1490
(Original post by Maham88)
Does anyone have the jan 2015 IAL paper ?
have you checked on the physicsandmathstutor website?
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3 years ago
#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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3 years ago
#1492
(Original post by JayGreen)
have you checked on the physicsandmathstutor website?
yeah i have they dont have it
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3 years ago
#1493
(Original post by Maham88)
Does anyone have the jan 2015 IAL paper ?
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3 years ago
#1494
thanks
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3 years ago
#1495

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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3 years ago
#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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3 years ago
#1497
(Original post by anonwinner)
when using dx/dy if you sub in the y value and flip the answer that gives you the gradient
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3 years ago
#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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3 years ago
#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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3 years ago
#1500
(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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