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Edexcel A2 C3 Mathematics 12th June 2015

Reply 1100

Nurishment

2

Original post by Medicjug

I think it's p

Posted from TSR Mobile

It's not

. I've done both parts and I know part a is correct because that's just standard stuff but I only got one solution to part b and I'm not sure if that the only solution (I've checked and it works though). I need to find that mark scheme

Edit: Nevermind, I found it. I got 1 out of the 3 solutions ugh I guess I would've got maybe 4/6 marks? I really need to stop losing easy marks.

(edited 8 years ago)

Reply 1101

Medicjug

2

Original post by Nurishment

It's not

. I've done both parts and I know part a is correct because that's just standard stuff but I only got one solution to part b and I'm not sure if that the only solution (I've checked and it works though). I need to find that mark scheme

Edit: Nevermind, I found it. I got 1 out of the 3 solutions ugh I guess I would've got maybe 4/6 marks? I really need to stop losing easy marks.

Yeah same I got two out the three and missed the last one. Such a silly mistake

Posted from TSR Mobile

Reply 1102

TeeEm

19

Original post by Nurishment

It's not

. I've done both parts and I know part a is correct because that's just standard stuff but I only got one solution to part b and I'm not sure if that the only solution (I've checked and it works though). I need to find that mark scheme

Edit: Nevermind, I found it. I got 1 out of the 3 solutions ugh I guess I would've got maybe 4/6 marks? I really need to stop losing easy marks.

these are not easy marks ...
the IYGB papers are very "exotic" ...
they will destroy the weak ...
they will dwarf the arrogant...
they will challenge the very able.

Original post by TeeEm

these are not easy marks ...
the IYGB papers are very "exotic" ...
they will destroy the weak ...
they will dwarf the arrogant...
they will challenge the very able.

:bhangra: Sorry Based God TeeEm. I was foolish and arrogant in my choice of words.

Edit: I just tried paper z... got stuck on the first question :frown:

rip

(edited 8 years ago)

Reply 1104

Maths degree

11

what proofing things do we need to know for the exam ?

Reply 1105

TeeEm

19

Original post by Nurishment

:bhangra: Sorry Based God TeeEm. I was foolish and arrogant in my choice of words.

There is nothing to be sorry about ...
I am just stating the rationale when I sat down to write these papers ...

56.jpg11.4KB

Reply 1106

curtiscowan10

Could someone please show me how to do 7b, couldnt really understand examsolutions method for this one😩

Reply 1107

Gome44

10

Original post by Medicjug

Thanksss everyone. How would writing it in cosP+cosQ help?

Posted from TSR Mobile

Cos(2x-α)-cos(x)=0=-2sin((3x-α)/2)sin((x-α)/2)

Then you solve sin(x-α)/2)=0 and sin(3x-α)/2)=0

Reply 1108

pswindon

2

Original post by curtiscowan10

Could someone please show me how to do 7b, couldnt really understand examsolutions method for this one😩

Here you go, hope this helps! Let me know if you have any problems!

Reply 1109

Nurishment

2

Original post by curtiscowan10

Could someone please show me how to do 7b, couldnt really understand examsolutions method for this one😩

Edit: Solution above ^

It's just simple use of the chain rule and the given equation and co-ordinates. Simple C1 - C2 work (in terms of working out the normal, finding an equation etc.)

I hope this helps (where I have drawn an arrow and my writing is cut off, I just said "this is the final answer but I like to simplify ^^" :wink:

.

(edited 8 years ago)

Reply 1110

Nurishment

2

Original post by pswindon

Here you go, hope this helps! Let me know if you have any problems!

Oh darn, you beat me to it :tongue:

Edit: and yours is neater than mine too. It's a pity I have been damned with bad handwriting but as long as the examiners can read it :u:

(edited 8 years ago)

Reply 1111

pswindon

2

does anyone know of any tough C3 questions that have popped up in the past?

Reply 1112

curtiscowan10

Original post by pswindon

Here you go, hope this helps! Let me know if you have any problems!

Perfect thank you!!

Reply 1113

Werfy

Are there any predicted papers for edexcel like the GCSE student have?

Reply 1114

Maths degree

11

Original post by pswindon

Here you go, hope this helps! Let me know if you have any problems!

could you have also done quotient rule ?

Reply 1115

Nurishment

2

Original post by Maths degree

could you have also done quotient rule ?

You couldn't have since the differential of 5 is 0 and you would've ended up with a differential of the whole equation as 0.

Reply 1116

Nurishment

2

Original post by pswindon

Here you go, hope this helps! Let me know if you have any problems!

By the way, not sure if you rushed it or misread but your equation at the end is slightly wrong. It should be y+(5/2) = 4/15(x+1), not y-(5/2)=4/15(x+1)

Reply 1117

Gome44

10

Original post by Nurishment

You couldn't have since the differential of 5 is 0 and you would've ended up with a differential of the whole equation as 0.

No, as there are two parts to the numerator with the quotient rule. The quotient rule is just a special case of the product rule

Reply 1118

Nurishment

2

Original post by Gome44

No, as there are two parts to the numerator with the quotient rule. The quotient rule is just a special case of the product rule

Can you do the question (with working) using the quotient rule and post it please?

Reply 1119

Gome44

10

Original post by Nurishment

Can you do the question (with working) using the quotient rule and post it please?

Yep, one sec

Edexcel A2 C3 Mathematics 12th June 2015

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