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Edexcel A2 C4 Mathematics June 2016 - Official Thread Watch

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    (Original post by Supermanxxxxxx)
    Could you not just sub the value of sec X you were given into secx+tan=-0.2


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    If I remember the problem correctly you were initially only given the value of secx + tanx
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    (Original post by 13 1 20 8 42)
    If I remember the problem correctly you were initially only given the value of secx + tanx
    You could also use the equation they have you earlier
    The secx - tanx =-5 or something
    Re arrange and sub in

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    (Original post by ImNervous)
    You could also use the equation they have you earlier
    The secx - tanx =-5 or something
    Re arrange and sub in

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    If I recall correctly it first asked you to show that secx - tanx = -5 given that secx + tanx = -0.2
    This needs the identity.

    Then you solve for secx easily by adding the equations
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    (Original post by 13 1 20 8 42)
    If I recall correctly it first asked you to show that secx - tanx = -5 given that secx + tanx = -0.2
    This needs the identity.

    Then you solve for secx easily by adding the equations
    Shouldn't the answer be positive 5/13?


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    (Original post by Glavien)
    Shouldn't the answer be positive 5/13?


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    2secx = -5.2
    secx = -2.6 = -13/5
    cosx = -5/13
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    (Original post by 13 1 20 8 42)
    2secx = -5.2
    secx = -2.6 = -13/5
    cosx = -5/13
    Thanks.


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    (Original post by Dohaeris)
    Is there anyone else doing the IYGB/Madasmaths papers? I find them to be better practice than the solomon papers
    Have you noticed that some of the mark schemes are wrong for the madas papers
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    (Original post by smackitintheair)
    Have you noticed that some of the mark schemes are wrong for the madas papers
    No, though I've only done papers U to Z. Which ones are wrong?
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    If I can only do x5 Madasmaths past papers for C3 on top of the work I've already done...


    what x5 papers would you recommend for me? I'd prefer something that would have a wide range though
    more on the challenging/difficult side of C3 papers since I'm scoring ok atm.

    Also, the same but with x7-8 C4 madasmaths papers would you recommend?
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    (Original post by Dohaeris)
    No, though I've only done papers U to Z. Which ones are wrong?
    Oh i meant on crashmaths.com sorry, Paper A if you want to try it. I'll probably do madamaths papers instead because the crashmaths ones arent very reliable.
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    (Original post by XxKingSniprxX)
    If I can only do x5 Madasmaths past papers for C3 on top of the work I've already done...


    what x5 papers would you recommend for me? I'd prefer something that would have a wide range though
    more on the challenging/difficult side of C3 papers since I'm scoring ok atm.

    Also, the same but with x7-8 C4 madasmaths papers would you recommend?
    For both C3 and C4, the author of the papers has classed Papers U to Z as 'Hard', with Papers S and T as 'Very Hard' and A to R as being 'Standard.'

    Personally, I've found most of the C4 papers very manageable, nothing too crazy. For C3, on the other hand, papers U to Z are quite difficult, much more so than the actual exam will be. Give a couple of those a pop if you're looking for something challenging.
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    (Original post by XxKingSniprxX)
    If I can only do x5 Madasmaths past papers for C3 on top of the work I've already done...


    what x5 papers would you recommend for me? I'd prefer something that would have a wide range though
    more on the challenging/difficult side of C3 papers since I'm scoring ok atm.

    Also, the same but with x7-8 C4 madasmaths papers would you recommend?
    Go for the "Hard" ones
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    in c4 how do you find the domain of a curve when your given the parametric equations???????

    thanks
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    Anyone finding C4 solomon papers sometimes easier than some past papers?
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    (Original post by michael242103)
    in c4 how do you find the domain of a curve when your given the parametric equations???????

    thanks
    You'll be given the domain in terms of t, for a parametric equation.
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    (Original post by SaadKaleem)
    You'll be given the domain in terms of t, for a parametric equation.
    sorry my bad. I meant when the question asks you to form the parametric equations in the form y=f(x) and then find the domain
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    (Original post by michael242103)
    sorry my bad. I meant when the question asks you to form the parametric equations in the form y=f(x) and then find the domain
    Sub in the values of t (from the given domain), in the parametric equation for x to find the corresponding values of x, that will be ur domain for x values.
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    (Original post by SaadKaleem)
    Sub in the values of t (from the given domain), in the parametric equation for x to find the corresponding values of x, that will be ur domain for x values.
    Say for instance this question??
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    https://a086a5a2f39bda93734c56a63fab...%20Edexcel.pdf

    In Q3a, when we are differentiating implicity, the combined x and y part(4xy in this case), what do we tend to do first? (Stupid question Ik, but I get stuck in this part ALL the time since I get confused and idk why though ). A minor explanation or working would be helpful. TIA!
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    (Original post by michael242103)
    Say for instance this question??
    Can easily be done with observation, sub in the x parameter equation, a very small value of t, say 0.01 (because 0 isn't included in the parameter domain) and observe what happens to x. You'll get a very large value of x.

    Sub t=pi/2 in the x parametric equation, you'll get x=0.

    Therefore the domain is x >= 0

    You could also plot the cartesian graph, to observe.
 
 
 
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