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    Post any qs here

    Also, (thanks to samdavyson for poining it out) check out the new spec (pg.29):

    http://www.edexcel.org.uk/VirtualCon...cification.pdf

    few things highlighted from the spec,

    'At least one question on the paper will require the use of proof' :eek:

    and it says ' A knowledge of the specification for C1 and C2, their preambles, prerequisites and associated formulae, is assumed and may be tested ' :eek:

    Edexcel Practice papers: http://intranet.millhill.org.uk/cgi/...0000000MMW&V=0
    Specimen Paper: http://www.edexcel.org.uk/VirtualCon...r_MkScheme.pdf
    Mock Paper:http://www.mrhughes.net/files/papers/C3/mock.pdf

    Summary Sheet: http://153rd.com/sam/AS/summarysheets/C3Sum.gif
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    Not necessarily proving a formula or identity, though, right?

    It might just be, like, prove some fractions equal such and such.
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    It says , methods of proof, including proof by contradiction and disproof by counter-example are required. =|
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    Do we have to know how to prove anything in particular?

    For example, in C2 we had to know how to prove the arithmetic and geometric series formulas, etc.
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    From what it says, anything from C1/C2 could come up.
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    I doubt they'll go out of their way to cover something which is completely irrelevant to C3 like sequences and series. I have a suspicion it'll be something like using the laws of logarithms and then having to draw a graph.
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    This question was posted by someone else as a P2 problem, but it's within the C3 syllabus, I'm sure. There were some answers but I'm wondering if there's an easier method.

    Here's the original link...

    http://www.thestudentroom.co.uk/t122667.html

    Please post responses in here as well, as this is the C3 revision thread!

    Sin3x = cosx
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    I am so not looking forward to C3.
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    Have any of u done the specimin paper. Some of it takes the piss. The solomons were easier than the specimin. Look at question 3b in the specimin, whats that all about.
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    dus that mean in C4 we mite have sum c1 2 3 in it?
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    1 + sinx - cosx = 1 + sin(0.5x + 0.5x) -cos(0.5x + 0.5x)

    = 1 + 2sin0.5xcos0.5x - cos²0.5x + sin²0.5x

    = 2sin0.5xcos0.5x + sin²0.5x + 1 - cos²0.5x

    = 2sin0.5xcos0.5x + 2sin²0.5x

    = 2sin0.5x(sin0.5x + cos0.5x)

    EDIT: This is 3b from the C3 specimen paper.
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    (Original post by mackin boi)
    dus that mean in C4 we mite have sum c1 2 3 in it?
    Yes. It'll be stuff like a binomial expansion question with a positive exponent that is greater than 1 (C2)

    Or having to use trig identities before you can integrate (C3)
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    (Original post by seankhn)
    1 + sinx - cosx = 1 + sin(0.5x + 0.5x) -cos(0.5x + 0.5x)

    = 1 + 2sin0.5xcos0.5x - cos²0.5x + sin²0.5x

    = 2sin0.5xcos0.5x + sin²0.5x + 1 - cos²0.5x

    = 2sin0.5xcos0.5x + 2sin²0.5x

    = 2sin0.5x(sin0.5x + cos0.5x)

    EDIT: This is 3b from the C3 specimen paper.

    i think htat should have been worth more marks, if i remember it was ony 3 marks. but it wasnt too bad
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    (Original post by Imaad)
    i think htat should have been worth more marks, if i remember it was ony 3 marks. but it wasnt too bad
    A specimen paper will only ever be used for revision, so if anything they'd make it harder than the real thing, I like to think. This is the first C3 paper ever as well, so we might get lucky.
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    Yeah in C4 they always have trapezium rule and thats from C2
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    (Original post by seankhn)
    1 + sinx - cosx = 1 + sin(0.5x + 0.5x) -cos(0.5x + 0.5x)

    = 1 + 2sin0.5xcos0.5x - cos²0.5x + sin²0.5x

    = 2sin0.5xcos0.5x + sin²0.5x + 1 - cos²0.5x

    = 2sin0.5xcos0.5x + 2sin²0.5x

    = 2sin0.5x(sin0.5x + cos0.5x)

    EDIT: This is 3b from the C3 specimen paper.
    thanks
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    (Original post by sb1986)
    thanks
    No problem.


    Anyone had a go at that sin3x = cosx question yet? The interval is 0 to 360°
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    f(x) = x+In2x-4

    xn+1=4-In2xn , with x0=2.4

    a.) Show your values of x1, x2, x3

    Can someone show me how they put the numbers into the formula, my mind is just blank and I can't get the right answer, I'm just doing something careless.
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    (Original post by Slice'N'Dice)
    f(x) = x+In2x-4

    xn+1=4-In2xn , with x0=2.4

    a.) Show your values of x1, x2, x3

    Can someone show me how they put the numbers into the formula, my mind is just blank and I can't get the right answer, I'm just doing something careless.
    x1 = 4-ln2x0

    x2 = 4-ln2x1

    x3 = 4-ln2x2

    Is that what you mean?
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    (Original post by seankhn)
    x1 = 4-ln2x0

    x2 = 4-ln2x1

    x3 = 4-ln2x2

    Is that what you mean?
    Yeah, what does these bits refer to though?
 
 
 
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