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    (Original post by anujsr)
    Then its alright!
    Are you sure? because I can't find the method in any mark scheme so I'm afraid the examiner will mark it wrong because it's not a way of doing it that's accepted by the mark scheme :/
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    (Original post by TheMoon)
    Are you sure? because I can't find the method in any mark scheme so I'm afraid the examiner will mark it wrong because it's not a way of doing it that's accepted by the mark scheme :/
    Then to be safe, if you still have time practice using the accepted method. Hopefully it will work out.
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    (Original post by anujsr)
    Then to be safe, if you still have time practice using the accepted method. Hopefully it will work out.
    If you have the edexcel textbook it is one of the proofs in topic 6
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    (Original post by Windowswind123)
    Usually around the hour mark.
    Thanks, just wanted to know so that i can finish on time. Usually i start lagging behind when i do questions too slowly
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    (Original post by TheMoon)
    Are you sure? because I can't find the method in any mark scheme so I'm afraid the examiner will mark it wrong because it's not a way of doing it that's accepted by the mark scheme :/
    Yeah, there's a range of alternative methods listed every year - yours is one of them. If you do the proof correctly, then you will get full marks
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    Any help with this proof by induction question please? Thanks!

    Zacken NotNotBatman kingaaran etc! Thank you!

    Question from CM PBI worksheet
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    This one is pretty difficult and took me a while, I doubt we would get this in the exam just because it is rather horrible. Name:  1463677569546.jpg
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    (Original post by anujsr)
    Thanks, just wanted to know so that i can finish on time. Usually i start lagging behind when i do questions too slowly
    Good luck - I was really worried about M3 for timing but I managed to finish that in an hour.
    Still stressed about D1 timing though - sure that should be two hours
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    Hi can someone explain how matrix rotation work for multiples of 45°? Thank youu
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    (Original post by TheMoon)
    This is the method I'm talking about, I've seen it in the textbook so I thought it would be allowed:



    ^this was from the textbook "review 2" solutions.
    ahhhh good to see my go to method for divsivion proofs - get it right every single time espicially if the question comes at the end of the paper! Unless of course it is like a question 2 or 3 proof where you can use the f(k+1) -f(k) method
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    (Original post by alfmeister)
    This one is pretty difficult and took me a while, I doubt we would get this in the exam just because it is rather horrible. Name:  1463677569546.jpg
Views: 79
Size:  29.9 KBName:  1463677608857.jpg
Views: 71
Size:  41.9 KBName:  1463677639902.jpg
Views: 58
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Views: 71
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    My neck hurts now!
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    (Original post by iMacJack)
    Any help with this proof by induction question please? Thanks!

    Zacken NotNotBatman kingaaran etc! Thank you!

    Question from CM PBI worksheet
    Normal divisibility (by 3). Consider f(k+1)  - f(k). See this if you're still stuck.
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    (Original post by anujsr)
    If you have the edexcel textbook it is one of the proofs in topic 6
    Oh is it? I have the edexcel textbook but I can't find it in there, but it's probably there somewhere, thanks!

    (Original post by kingaaran)
    Yeah, there's a range of alternative methods listed every year - yours is one of them. If you do the proof correctly, then you will get full marks
    Thanks for the assurance! I assumed that the methods listed are the only ones accepted but that's good if they'll accept the way I do it as long as it's done right.
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    (Original post by TheMoon)
    Thanks for the assurance! I assumed that the methods listed are the only ones accepted but that's good if they'll accept the way I do it as long as it's done right.
    This is true for any question. Also remember that examiners get a more detailed copy of the markscheme than the one you see.
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    Can anyone explain where the 18p^2 goes in this question? seems to disappear? From the June15 paper question 8 (a).
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    (Original post by indecisiveness)
    Hi can someone explain how matrix rotation work for multiples of 45°? Thank youu
    If you work from the unit vectors.
    The i vector if you rotate it 135 degrees for example anticlockwise will end up going around until it reaches the (+x, -y) quadrant. The x coordinate of that will be -cos45 and the y coordinate sin45.

    The j vector will rotate until it reaches the (-x, -y) quadrant. The x coordinate will be -cos45 and the y coordinate will be -sin45.

    So (1,0) will change to (-sin45, cos45) and (0,1) will change to (-sin45, -cos45).
    Alternatively you can use the formula sheet.
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    (Original post by Zacken)
    This is true for any question. Also remember that examiners get a more detailed copy of the markscheme than the one you see.
    Oh that's good, I thought that mark scheme was the one they use since it has a lot of notes, but that's definitely good if they get an even more detailed one.

    (Original post by tazza ma razza)
    ahhhh good to see my go to method for divsivion proofs - get it right every single time espicially if the question comes at the end of the paper! Unless of course it is like a question 2 or 3 proof where you can use the f(k+1) -f(k) method
    Yeah it's brilliant! Never fails, it makes everything work out very easily even on the harder questions. Glad that I'm not the only one using it.
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    (Original post by Coreling)
    Can anyone explain where the 18p^2 goes in this question? seems to disappear? From the June15 paper question 8 (a).
    Take nine out as a factor: 9(p^4 + 2p^2 + 1)
    Let x=p^2
    9(x^2+2x+1)
    Factorise:
    9(x+1)^2
    Square root:
    3(x+1)
    Resubstitute:
    3(p^2+1)
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    (Original post by Zacken)
    Normal divisibility (by 3). Consider f(k+1)  - f(k). See this if you're still stuck.
    Aha got ya.

    Also, you know in the F1 Jan 16 paper you sit, you see the question about the coordinates of where the normal intersects the parabola again (or something along those lines) and you have a dirty quadratic with like p^3 and p^4's and what not - how on earth do you use the quadratic formula successfully to work out the coordinates?? I'm so baffled!

    https://gyazo.com/98e0758d1498ec2a5addcd7bfc1f15ee

    Part B is what I'm on about
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    (Original post by Coreling)
    Can anyone explain where the 18p^2 goes in this question? seems to disappear? From the June15 paper question 8 (a).
    Oops...

    (1 + p^2)^2 is 1 + 2p^2 + p^4

    I suspect you forgot about the middle term!
 
 
 
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