Official Edexcel C3 Discussion Thread

You have to remember that there are A*s this year so the grade boundaries will be higher regardless of the difficulty of the paper to filter out the A grade people from the A*s. So I think realistically an A* will be around 70-72 and an A will be 63-67?

You have to remember that there are A*s this year so the grade boundaries will be higher regardless of the difficulty of the paper to filter out the A grade people from the A*s. So I think realistically an A* will be around 70-72 and an A will be 63-67?

If an an A grade is not below 60 for this years paper, then Edexcel are mad.

it was ok, mike! i'm hoping for 90+ UMS! what about you?

http://www.wolframalpha.com/input/?i=y%3D%28e%5Eln%28%28x-1%29%5E2%29%29%2B3

judge for yourself if it is fg(x) >=3

i don't think that's true, because that wouldn't be fair to us - people who have done previous C3 exams can get an A* if they haven't certificated yet

A* grades DO NOT mean grade boundaries will be higher. Grade boundaries will be the same as they would of been any other year, but a certain amount of people, who get 90%+ can hope to get an A* overall.

Looking at the trends of previous papers is stupid. Each paper a certain % of people should get an A, which is how the grade boundaries are altered. I personally believe that:

100 % UMS = 70-71+
80% UMS (A) = 61-63+

if you stated the correct rule (product, quotient, etc), and you dy/dx'd correctly but just got it wrong, it then depends on the stage that you reached more than anything, where did you think you reached?

Like i said, i used the quotient rule and differentiate it correctly and got something over x^2. I should have just left it but it was worth 4 marks so i thought i have to simplify it. i should have multiply my answer by 1/x^2 not x^2. Cant believe i made that stupid mistake

did you rearrange the function to form (x+1)^2 + 3 ? if so that will minimize any chance of big marks lost, only maybe A1 for the range not being > 3

Yeah i did that and i thought that x>1 has nothing to do with the composite function so i crossed out my original answer fg(x) >= 4 and put 3 instead

my views on the paper were that the only 2 difficult questions were the question with cosec^2 2x - cot2x, this is a discrimination question ( in my view) because people are going to forget to write cot2x as cos2x/sin2x, which i did not forget to do, but i didn't write the solutions down as i forgot (...)

I got all the solution but one extra x=0 cos i solved for tan2x=0. I forgot that the graph y=cotx doesnt go though 0. Do you think the examiner might let this off considering it was a hard paper

i wrote that too