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    (Original post by Loz17)
    Ok difficult one.

    Show that cos(2x + \frac{\pi}{3}) + cos(2x - \frac{\pi}{3}) = cos2x
    sarcasm?
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    (Original post by Loz17)
    Ok difficult one.

    Show that cos(2x + \frac{\pi}{3}) + cos(2x - \frac{\pi}{3}) = cos2x
    I saw that question in a paper today: :shot:

    Does anyone have the Jan 10 paper?
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    I want lots of trig questions :') and then ill be happy xD
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    I got 63 in Jan resitting to hopefully get an A
    Feeling A LOT more confident than Jan.. As I've actually revised this time!!
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    Quick query..when you have to do multiple transformations of a graph, eg 2f(x-1), or 4f|x-1| *modulus sign btw*, does the order in which you apply the transformations matter at all? So say, do you have to do the stretch before the horizontal movement, or can you do it the other way round without it making any difference? And does a modulus sign affect the order you apply the transformations (if it mattered in the first place at all?)
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    (Original post by Loz17)
    Ok difficult one.

    Show that cos(2x + \frac{\pi}{3}) + cos(2x - \frac{\pi}{3}) = cos2x
    Lol, why did i agree to this, especially with the crazy latex thingy this forum uses... gimme a minute....

    Multiply them out using formula off sheet...

    Get (cos2Xcospi/3 - sin2Xsinpi/3)+(cos2Xcospi/3 + sin2Xsinpi/3)

    the sin bits cancel out and cospi/3 is 1/2

    1/2 cos2X +1/2 cos2X = Cos2X

    Done, Next....
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    (Original post by teh_killer)
    sarcasm?
    Actually no sarcasm when you're **** at maths :nothing:
    (Original post by h-star)
    I saw that question in a paper today: :shot:

    Does anyone have the Jan 10 paper?
    **** isn't it. Lets hope its a nice paper so we're both at uni next year

    Paper and MS.
    Attached Images
  1. File Type: pdf Jan 10 C3.pdf (271.6 KB, 67 views)
  2. File Type: pdf C3 Jan 10 MS.pdf (152.0 KB, 47 views)
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    (Original post by mfc20)
    Quick query..when you have to do multiple transformations of a graph, eg 2f(x-1), or 4f|x-1| *modulus sign btw*, does the order in which you apply the transformations matter at all? So say, do you have to do the stretch before the horizontal movement, or can you do it the other way round without it making any difference? And does a modulus sign affect the order you apply the transformations (if it mattered in the first place at all?)
    Only if it applies to the same part i.e both are function changes or both are variable changes. Rule of thumb seems to be do it in the oder the question says to do it.
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    (Original post by Loz17)
    Actually no sarcasm when you're **** at maths :nothing:

    **** isn't it. Lets hope its a nice paper so we're both at uni next year

    Paper and MS.
    That would be awesome! Thank you! :woo:
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    (Original post by Loz17)
    Actually no sarcasm when you're **** at maths :nothing:

    **** isn't it. Lets hope its a nice paper so we're both at uni next year

    Paper and MS.
    Thanks for the Paper/MS

    Time to sit down and work at it... This is a hard one is it?

    What were the UMS / boundaries on it? If anyone happens to know...
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    (Original post by CMM)
    Thanks for the Paper/MS

    Time to sit down and work at it... This is a hard one is it?

    What were the UMS / boundaries on it? If anyone happens to know...
    I think so. I'm about to do it as well. Printed it off earlier. Putting laptop away to do it in exam conditions and timed as well.
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    (Original post by CMM)
    Thanks for the Paper/MS

    Time to sit down and work at it... This is a hard one is it?

    What were the UMS / boundaries on it? If anyone happens to know...
    I found it pretty hard but it was 59/75 for an A so it didn't go down that much
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    Trig practice :




    Edit : The irony of this makes me laugh :d

    Well time to do some real practice...
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    Need to get 100 in this o.O Jan 10 practice was a distaster but now I know how the logs bit works it's cool
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    i can never figure out how to do the 2marker question where after you put an equation in the form: R(cosx+O), it asks you what the maximum value is (which is +R), but i get stuck on where it asks "find the smallest possible x value where this maximum occurs"
    how am i meant to do that?
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    i think they will be a few questions like the the log question in january which are different to that which has been on previous exams to make it quite hard! although whatever they have on it im sure it will be a piece of piss compared to c4 on friday!
    learning trig idenities is key i think and my tip is just learn sinsquaredx + cossquared x = 1 as the other "squared relationships can be worked out from this. all the other identites can be worked out from the cos(a +B) and Sin( a+b) formula which you get given!
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    how likely are trig equations with arcsin/ arccos?? I pretty much have no idea when they come up...
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    Hey,

    Has anyone got the June 2009 C3 Markscheme?!

    Searching all over el-goog but can only find unofficial markschemes!
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    I got a D in January :P but this time I am hoping i'll get 90%+ :P which is what I am getting in past papers :P Totally confident about this Can't wait to get it out of the way
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    (Original post by CMM)
    Trig practice :




    Edit : The irony of this makes me laugh :d

    Well time to do some real practice...
    2 (sec^2 (c))^1/2 = 2 sec (c)

    LoL. Just got what it said!

    dy/dx:

    2 sec (c) tan (c)

    I'm on it this week. Last week I was struggling with C3, now i'm getting everything right. Done loads of past papers and my worst score was 72/75 in Jan 2007.

    Anyone know when the hardest C3 paper was set?
 
 
 
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