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# Edexcel FP3 June 2015 - Official Thread watch

1. (Original post by mmms95)
yeah, why don't you want to?
tired of exams i guess
2. Can someone help me on June 2009 question 8. I keep getting the negative of the right answer :/
Attached Images

3. (Original post by Gome44)
Can someone help me on June 2009 question 8. I keep getting the negative of the right answer :/
I'm getting that too when I do it.

edit: actually wait no, don't the limits start as 1 to 0 and then because of the minus they switch so 0 to 1 with a positive sign?

edit again: I started from the given parametric formula in the booklet so that the limits were 0 to pi/2 rather than pi/2 to 0 but I don't see why the manner in which you changed them from x could possibly be wrong
4. (Original post by Gome44)
Can someone help me on June 2009 question 8. I keep getting the negative of the right answer :/
You have your limits the wrong way around, they want it from 0 to alpha so by switching limits the two negatives cancel
5. (Original post by Navo D.)
You have your limits the wrong way around, they want it from 0 to alpha so by switching limits the two negatives cancel
Switching which limits??

Also on my last line the upper limit looks like a 10 when it should be a 1
6. (Original post by Gome44)
Switching which limits??

Also on my last line the upper limit looks like a 10 when it should be a 1
The integration is carried out between 0 and pi/2, and according to the substitution c will be 1 and 0 respectively. Since they want it in the form of an integral from 0 to alpha, you have to switch the limits which helps you cancel that pesky negative
7. (Original post by Gome44)
..
I think the issue may be that when you switched the variable to start with (from x to theta, not theta to c) your dx/dtheta was negative but this negative sign doesn't appear
So at that point you should have a negative and then it switches to go from 0 to pi/2 instead of pi/2 to 0.
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10. (Original post by 13 1 20 8 42)
I think the issue may be that when you switched the variable to start with (from x to theta, not theta to c) your dx/dtheta was negative but this negative sign doesn't appear
So at that point you should have a negative and then it switches to go from 0 to pi/2 instead of pi/2 to 0.
ah, ok, thanks

If i was in the real exam i probably would have just fudged it though
11. how would you simplify (x2-1)n +(x2-1)n-1?
12. (Original post by violin101)
how would you simplify (x2-1)n +(x2-1)n-1?
factorize the bracket in its lowest power
13. (Original post by violin101)
how would you simplify (x2-1)n +(x2-1)n-1?
Factor the expression to the n-1.
So it becomes x^2(x^2-1)^N-1

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14. (Original post by violin101)
how would you simplify (x2-1)n +(x2-1)n-1?
what's the question?, like which paper
normally I would but I am very busy at the moment.
here is my solution from my archive
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16. Can someone help me with question 8 for the june 14 R paper?

I don't understand why they have changed the signs from -2i-11j+5k to 2i+11j-5k

Also for the second part of the question it only works if in the first part you eliminated the X variable and I don't understand why?

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

https://3a14597dd5c7aa2363f067571766...%20Edexcel.pdf
17. Why are some of the mark schemes like this? Makes it almost completely unreadable.

http://gyazo.com/babd5e71a51fde96fc84b5b8f32e4eaf
18. (Original post by Elcor)
Why are some of the mark schemes like this? Makes it almost completely unreadable.

http://gyazo.com/babd5e71a51fde96fc84b5b8f32e4eaf
What past papers are they from? I've never seen any like that before
19. (Original post by luckystar1900)
What past papers are they from? I've never seen any like that before
June 13 - I've seen it quite a few times. Perhaps it's my computer somehow?
20. (Original post by Elcor)
June 13 - I've seen it quite a few times. Perhaps it's my computer somehow?
Seems so.. this is how the same markscheme looks on my computer, I get my past papers from phsyicsandmathstutor.com so perhaps there is some weird formatting going on for yours

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