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    (Original post by rachelw785)
    I am struggling with parts of C2, especially with the differentiation parts and finding the maximum and minimum points etc., can anyone tell me how they remember how to do this? I have no idea :confused:
    To Differentiate: multiplying the coefficient of x by the power, and then the power minus one.
    To find the max and minimum points; make the gradient (the first differentiation or dy/dx) equal 0. Use this to find x

    Hope this helps, sorry if its unclear..
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    (Original post by Olon)
    Gaaaahhh, i feel like i'm being ignored now. SOMEONE PLEASE HELP ME. I'm starting to PANIC
    what the query
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    Just some formulas which are not on the formula sheet & the proof of the first n terms in a geometric sequence just in case anyone needs it.
    Attached Images
  1. File Type: pdf C2.pdf (107.8 KB, 183 views)
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    i dont know how i got a D last year but right now im feeling so confident. does anyone have any other question for this paper i can do since i went through all the past papers?
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    When can you use ncr on calculator and when do u have to use n! /r! (n-r)!
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    Are there any exam questions, where you have to change the log bases?
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    Someone answer this question

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    (Original post by frozo123)
    what the query
    https://c4a3f001dcd45afe69d0ceec8300...%20Edexcel.pdf

    Q6
    Q8c,d,e
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    (Original post by Alevel2015.)
    When can you use ncr on calculator and when do u have to use n! /r! (n-r)!
    Use the second formula for binomials in the formula book, you use it again at A2 and it's a lot easier to use imo.
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    (Original post by leoben49)
    Just some formulas which are not on the formula sheet & the proof of the first n terms in a geometric sequence just in case anyone needs it.
    Can you print screen please, my pc doesn't seem to read the size of the file :/
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    (Original post by tevagx51)
    whats up olon ill help you

    Tevaaaaaaaaaaaaaaaaaaagxhttps://c4a3f001dcd45afe69d0ceec8300...Edexcel.pdfFor Q6) whenever they ask you if it's a diameter do you use that formula?And can you help me with: 6c, q8b and 9a

    Thanks
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    (Original post by Dahir123)
    Someone answer this question

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    Is this a genuine question? its in degrees and the range is in radians? what?
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    Someone please help me with this question because I am completely unable to understand how to simplify
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    http://qualifications.pearson.com/co...-June-2014.pdf

    Can someone explain q8 please.
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    (Original post by Alevel2015.)
    When can you use ncr on calculator and when do u have to use n! /r! (n-r)!
    They both do the exact same thing, nCr is just a quick calculator shortcut of writing out that formula
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    (Original post by usmanzubair)
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    Someone please help me with this question because I am completely unable to understand how to simplify
    Multiply it out by the denominator, and then bring it to the left hand side making it equal to zero And then factorise I think
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    (Original post by usmanzubair)
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    Someone please help me with this question because I am completely unable to understand how to simplify
    Multiply both sides by (4sin(2*theta) - 1) and you've got something you can factorise.
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    (Original post by the north)
    i dont know how i got a D last year but right now im feeling so confident. does anyone have any other question for this paper i can do since i went through all the past papers?
    The question attached
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    (Original post by usmanzubair)
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    Someone please help me with this question because I am completely unable to understand how to simplify
    -Multiply both sides by 4sin2 theta -1

    -Subtract the sin2theta from the other side giving you 3sin2theta -1=0

    - Move the 1 to the other side to give 3sin2theta =1

    - Divide by 3 to give sin2theta = 1/3

    - Sin inverse giving 2theta =sin-1 (1/3)

    - Get your 2 results, and then divide by two, giving you theta, take into consideration the range
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    (Original post by Olon)
    If you could help me with these
    https://c4a3f001dcd45afe69d0ceec8300...Edexcel.pdfFor Q6) whenever they ask you if it's a diameter do you use that formula?And can you help me with: 6c, q8b and 9a
    Which formula?
    For 6 a centre is (3, -2) and radius is 5
    For 6 b you just work out the distance between P and Q by drawing (or imagining) a right angled triangle and using Pythagoras and that should be the diameter. Essentially just sqrt((- 5 - 1) ^ 2 + (7 - - 1)^2) should equal 5*2.
    For 6 c if PRQ is 90 deg then R lies on the circle. You might like to draw this out if you can't see this straight away. As R is on y axis, bung x = 0 into the first equation in part a and solve.
    For 8 b you can work out the constant logs on top of the equation. Then multiply everything by log2(x) and you get (log2(x))^2 = 9 and x = 2^3 and x = 2^-3
    For 9a work out arc length using 2*pi*r*(angle/2pi) = r here and work out sector area using pi*r^2*(angle/2pi) = r^2/2 here and then add areas of surfaces up
 
 
 
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