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# Edexcel FP3 June 2015 - Official Thread watch

1. (Original post by physicsmaths)
Na I mean grip rule.
The thumb is direction of normal vector. With direction vectors being the turn from a to b ie axb.

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I am fairly certain you mean FLHR given your explaination .

This is the grip rule:
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2. (Original post by Gome44)
I am fairly certain you mean FLHR given your explaination .

This is the grip rule:
But the grip rule is to do with magnetic fields.

He means just another 'rule' that uses the right hand. Similar to that but the thumb shows the direction of the normal and the thumbs point from a to be in axb.
3. June 2014 question 6 is an absolute pain and involves virtually no FP3 stuff apart from the fact the context is an ellipse. What a disgusting question. Hope nothing like that comes up for us.
4. (Original post by bwr19)
June 2014 question 6 is an absolute pain and involves virtually no FP3 stuff apart from the fact the context is an ellipse. What a disgusting question. Hope nothing like that comes up for us.
I agree; it's a horribly designed question. I just want it to be another simple "find the value of a" one rather than loci
5. Does anyone have general notes on hypothesis testing
6. (Original post by nayilgervinho)
Does anyone have general notes on hypothesis testing
Think you're meant to be in the S2 thread. :P

http://www.thestudentroom.co.uk/show....php?t=3156207
7. June 2012 was a crap paper. It's not hard, it's just genuinely bad. It's one where you're only 80% sure what you're doing most of the time.
8. Any tips or tricks on spotting the method to use for reduction formulae? I though I was getting somewhere and then tried June '14 R paper and got no where with it
9. (Original post by bwr19)
Think you're meant to be in the S2 thread. :P

http://www.thestudentroom.co.uk/show....php?t=3156207
Oh right I keep on switching between the two.

https://2d31ca6ec4f6115572728c3a9168...%20Systems.pdf
11. (Original post by mmms95)
June 2014 ial question 5a
markscheme https://3a14597dd5c7aa2363f067571766...%20Edexcel.pdf

qustion paper https://3a14597dd5c7aa2363f067571766...%20Edexcel.pdf

also questions 7a, how to you simplify 720^3/2 x2/9 ???? calc doesn't give exact ans???

and question8d, i don't understand why they have used 2i+j+3k as the point a i thought A in the vector equation of a line is a point on the line, but they have used the direction vector of it???
can someone please answer this?? this is really stressing me out ahah :P
12. (Original post by Teddysmith123)

https://2d31ca6ec4f6115572728c3a9168...%20Systems.pdf
generate co-ordinates for Q and then sub them in for x and y and show that the locus given is true
13. (Original post by Teddysmith123)

https://2d31ca6ec4f6115572728c3a9168...%20Systems.pdf
Did you mean June 2010 8b
14. (Original post by mmms95)
June 2014 ial question 5a
markscheme https://3a14597dd5c7aa2363f067571766...%20Edexcel.pdf

qustion paper https://3a14597dd5c7aa2363f067571766...%20Edexcel.pdf

i don'tt understand where they got the sin^2(theta) in the first line of the markscheme?? split up cos^n(x) to cos(x)cos^n-1(x) and got v=sinx so where did they get sin^2(x) ???

(by x i mean theta, x is just faster to type)

also questions 7a, how to you simplify 720^3/2 x2/9 ???? calc doesn't give exact ans???

and question8d, i don't understand why they have used 2i+j+3k as the point a i thought A in the vector equation of a line is a point on the line, but they have used the direction vector of it???
sin^2(x) as differential of cos^(n-1)(x) is (n-1)cos^(n-2)(x)sin(x)

not sure about the others and I need to look at S2 aha
15. (Original post by violin101)
generate co-ordinates for Q and then sub them in for x and y and show that the locus given is true
and I have found out what x and y= and I subbed them in but I don't understand how to simplify it

I have 16cos^2t+64sin^2tcos^t all over (1+4sin^2t)^4

how do I simplify this further?

(Original post by ravelhua)
Did you mean June 2010 8b
Yes I meant that one

16. Is this wrong on the i part of the determinant?
17. (Original post by violin101)
sin^2(x) as differential of cos^(n-1)(x) is (n-1)cos^(n-2)(x)sin(x)

not sure about the others and I need to look at S2 aha
oooh right, silly mistake, thanks np
18. Is there a table of past boundaries anywhere?
19. (Original post by smem_96)

Is this wrong on the i part of the determinant?
Yes. b1 should be b2.
20. q7a june 14 replaced paper,

why have they used that formula, isnt that the one for arc length?

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