# Edexcel A2 C3 Mathematics 12th June 2015Watch

This discussion is closed.
3 years ago
#521
(Original post by studentwiz)
how do you find the max of 2root5sin(3thetha-1.107)^2
Well the Max value will be when sin3theta-1.107 is 1. So what would the min value be?

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3 years ago
#522
(Original post by samb1234)
Well the Max value will be when sin3theta-1.107 is 1. So what would the min value be?

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0 ? I got 104 max and 4 minbut how would you do part ii and c ii?
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3 years ago
#523
Anyone know why if you have dy/dx= -e^x you get a gradient of -1???? thanks!! (I'm finding your posts reeeeaaally helpful!)
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3 years ago
#524
anyone bothering learning proof by contradiction etc. considering they've never actually come up in an exam?
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3 years ago
#525
(Original post by broconomist)
anyone bothering learning proof by contradiction etc. considering they've never actually come up in an exam?
Is it even on the syllabus?

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3 years ago
#526
(Original post by studentwiz)
0 ? I got 104 max and 4 minbut how would you do part ii and c ii?
They would be the values of theta such that sintheta =1 or sin theta =0 respectively

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3 years ago
#527
(Original post by Krollo)
Is it even on the syllabus?

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there's a section in the textbook that I have (cambridge C3 A2 maths for edexcel) which is concerned with proof by contradiction, definite proofs etc. I've only seen one question on it though and that was on an elmwood paper
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3 years ago
#528
(Original post by broconomist)
there's a section in the textbook that I have (cambridge C3 A2 maths for edexcel) which is concerned with proof by contradiction, definite proofs etc. I've only seen one question on it though and that was on an elmwood paper
Good to know! thanks!
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3 years ago
#529
(Original post by broconomist)
there's a section in the textbook that I have (cambridge C3 A2 maths for edexcel) which is concerned with proof by contradiction, definite proofs etc. I've only seen one question on it though and that was on an elmwood paper
Its not on the spec never done any of that and its not in the heinman book which I believe is the official textbook

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3 years ago
#530
(Original post by samb1234)
They would be the values of theta such that sintheta =1 or sin theta =0 respectively

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thanks ive done part b but part cii) the answer is 2.46 and i got 0.123 can you explain what im doing wrong please
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3 years ago
#531
(Original post by samb1234)
Its not on the spec never done any of that and its not in the heinman book which I believe is the official textbook

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yeah that's what I'm hoping for, but if you look on this: http://www.waldomaths.com/docs/edex/..._6665_Spec.pdf

"Methods of proof, including proof by contradiction and disproof bycounter-example, are required."
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3 years ago
#532
(Original post by Viggi)
Anyone know why if you have dy/dx= -e^x you get a gradient of -1???? thanks!! (I'm finding your posts reeeeaaally helpful!)
You only get that when x=0
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3 years ago
#533
(Original post by Mr T Pities You)
You only get that when x=0
*lightbulb* ...I understand now... :P
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3 years ago
#534
I doubt proof by contradiction would come up....ever. But knowing Edexcel this year and how hellbent they are to prove to the world that A levels are not easy at all, they might sneak it in and come up with some random twisted reason for how it is in the specification -_-
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3 years ago
#535
ok, another question - what is the rule behind e^1/2ln9 becoming e^ln3 ? ... thanks!!!
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3 years ago
#536
(Original post by studentwiz)
thanks ive done part b but part cii) the answer is 2.46 and i got 0.123 can you explain what im doing wrong please
What's the rsinalpha form?

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3 years ago
#537
(Original post by broconomist)
there's a section in the textbook that I have (cambridge C3 A2 maths for edexcel) which is concerned with proof by contradiction, definite proofs etc. I've only seen one question on it though and that was on an elmwood paper
It isn't on the syllabus, but that's a very nice question. (I assume you're meant to consider the parity of the factors?)

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3 years ago
#538
(Original post by Guitardude165)
I doubt proof by contradiction would come up....ever. But knowing Edexcel this year and how hellbent they are to prove to the world that A levels are not easy at all, they might sneak it in and come up with some random twisted reason for how it is in the specification -_-
my sentiments exactly!
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3 years ago
#539
(Original post by Viggi)
ok, another question - what is the rule behind e^1/2ln9 becoming e^ln3 ? ... thanks!!!
Using Log rules (power one specifically) raise the 1/2 up to the 9 which becomes √9 (using indice laws) and therefore that becones 3. So e^1/2ln9 = e^ln3
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3 years ago
#540
(Original post by broconomist)
my sentiments exactly!
It has been really tough!!
0
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