# Edexcel A2 C3 Mathematics 12th June 2015Watch

This discussion is closed.
4 years ago
#341
Help on Q 31
I got 1/4 on that question :|

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4 years ago
#342
(Original post by zed963)
The domain of the original is the range of the inverse and vice versa.

The second thing is that when it comes to fractions, X cannot equal a value which causes the denominator to =0

In terms of e^x graph, the domain is XER and the range is y>0

There will be good videos on YouTube which explain it perfectly.

Also, try to give us a question that you're stuck with so we can discuss it.

I now have a question. So for January 2012 c3, I got question 7 part c I think. The one where it's working out the domain of the inverse. I understand this is the range for f(x) but I had x>1 and not x>0 so I'm just confused now haha

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4 years ago
#343
(Original post by lam12)
I now have a question. So for January 2012 c3, I got question 7 part c I think. The one where it's working out the domain of the inverse. I understand this is the range for f(x) but I had x>1 and not x>0 so I'm just confused now haha

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Try drawing the graph of f^-1(x)

The denominator of the function cannot equal 0. Therefore any value greater than 0 is fine.

You knew that the denominator had to be greater than 1 but what you need to know is that it can also equal 1.

The number that it cannot equal is 0. Hence x>0

Have a look at this, http://www.examsolutions.net/a-level...0&solution=7.3

It provides a graphical perspective.
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4 years ago
#344
(Original post by TheGemini)
Help on Q 31
I got 1/4 on that question :|

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what book is that?
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4 years ago
#345
(Original post by Paras Agarwal)
well major major respect to you for your mock score! i suggest you give edexcel june 13 a try . #HARDESTPAPEROFALLTIME
are u on about paper june 13 o1r? if so, that is tuff! i managed to scrape an A though haha....
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4 years ago
#346
How do you remember which method of integration to use for different types of questions?
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4 years ago
#347
(Original post by l1lvink)
How do you remember which method of integration to use for different types of questions?
Chain rule = function within a function e.g. (x+2)^4
Product rule = function x function e.g (x+2)(x+7)^4
Quotient rule = function/function e.g. (x+2)/(x+8)
4 years ago
#348
(Original post by BBeyond)
Chain rule = function within a function e.g. (x+2)^4
Product rule = function x function e.g (x+2)(x+7)^4
Quotient rule = function/function e.g. (x+2)/(x+8)
Thats differentiation, I'm on about parts/chain/substitution...
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4 years ago
#349
(Original post by l1lvink)
Thats differentiation, I'm on about parts/chain/substitution...
**** sorry aha assumed you meant diff as it was c3 thread my bad
4 years ago
#350
(Original post by BBeyond)
**** sorry aha assumed you meant diff as it was c3 thread my bad
Ah, I've noticed my mistake too--I assumed this was AQA (my board), so perhaps you guys don't do integration in C3
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4 years ago
#351
(Original post by l1lvink)
Ah, I've noticed my mistake too--I assumed this was AQA (my board), so perhaps you guys don't do integration in C3
Nah integration is in c4 on edexcel
4 years ago
#352
Hey guys,

I wanted to ask, when you have to find X2, X3, ... in the iterative formula, do the answers have to always be in radians?
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4 years ago
#353
(Original post by Emma!95)
Hey guys,

I wanted to ask, when you have to find X2, X3, ... in the iterative formula, do the answers have to always be in radians?
I would assume so unless otherwise specified.

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4 years ago
#354
(Original post by Emma!95)
Hey guys,

I wanted to ask, when you have to find X2, X3, ... in the iterative formula, do the answers have to always be in radians?
if you are working with sin or cos i.e if you see sin or cos in the question or the range given is in terms of pi we always use RADIANS. otherwise if no sin or cos present and the range is in degrees then we work in normal degrees
1
4 years ago
#355
(Original post by Ripper Phoenix)
if you are working with sin or cos i.e if you see sin or cos in the question or the range given is in terms of pi we always use RADIANS. otherwise if no sin or cos present and the range is in degrees then we work in normal degrees

Thank you!! That actually makes sense!!
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4 years ago
#356
(Original post by Emma!95)
Thank you!! That actually makes sense!!
I should point out -occasionally, e.g. on last year's paper, there was a question on iteration where degrees/radians was not specified. I believe the 'default' from C3 onwards in radians.

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4 years ago
#357
(Original post by Krollo)
I should point out -occasionally, e.g. on last year's paper, there was a question on iteration where degrees/radians was not specified. I believe the 'default' from C3 onwards in radians.

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you can but thats wrong id say. You only use radians when you have a sin or cosine in the question, we have been taught this thats why i know haha
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4 years ago
#358
(Original post by Krollo)
I should point out -occasionally, e.g. on last year's paper, there was a question on iteration where degrees/radians was not specified. I believe the 'default' from C3 onwards in radians.

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oh okay I would defo watch out, Thank you for letting me know!
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4 years ago
#359
(Original post by Emma!95)
Thank you!! That actually makes sense!!

welcome!
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4 years ago
#360
(Original post by Krollo)
I should point out -occasionally, e.g. on last year's paper, there was a question on iteration where degrees/radians was not specified. I believe the 'default' from C3 onwards in radians.

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Yes, I did that paper yday - and the answer was in radians.
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