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    (Original post by mmms95)
    yeah, why don't you want to?
    tired of exams i guess
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    Can someone help me on June 2009 question 8. I keep getting the negative of the right answer :/
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    (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
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    (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
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    (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
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    (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
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    (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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    Join the Further Mathematics Chat-room here http://us20.chatzy.com/16507605831021
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    Can someone please help me with June 2014, 6c
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    (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
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    how would you simplify (x2-1)n +(x2-1)n-1?
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    (Original post by violin101)
    how would you simplify (x2-1)n +(x2-1)n-1?
    factorize the bracket in its lowest power
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    (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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    (Original post by violin101)
    how would you simplify (x2-1)n +(x2-1)n-1?
    what's the question?, like which paper
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    (Original post by adorablegirl1202)
    Can someone please help me with June 2014, 6c
    normally I would but I am very busy at the moment.
    here is my solution from my archive
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    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
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    Why are some of the mark schemes like this? Makes it almost completely unreadable.

    http://gyazo.com/fee9b3a3c78819933672642adef6be57
    http://gyazo.com/babd5e71a51fde96fc84b5b8f32e4eaf
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    (Original post by Elcor)
    Why are some of the mark schemes like this? Makes it almost completely unreadable.

    http://gyazo.com/fee9b3a3c78819933672642adef6be57
    http://gyazo.com/babd5e71a51fde96fc84b5b8f32e4eaf
    What past papers are they from? I've never seen any like that before
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    (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?
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    (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 Name:  pmt.PNG
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