OCR C4 (not mei) 18th June 2013 revision

Can I also just point out, you can plot points of the graph on the Casio calculator. That Wouk have also showed you that te point was a minimum


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Yeah, I can't draw graphs for sit, definitely lost two marks on the polar for FP2
Realised with a minute to spare, and my axis took up all the space, oh well, just means I have to try for M2


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For the question where it was (1/4)ln(3), would it be acceptable to right (1/2)(ln(root3)), as it didn't specifically say integers, it just said express it in the form alnb. Also, for the integration by substitution one, did it require you to put it back in terms of x, or could you have left it in terms of u? Thanks

are you mr m's disowned son because you didnt get 100 ums in maths?

You obviously haven't taken an FP2 exam, it goes far beyond a quadratic graph, taking a lot longer than a few seconds to sketch XD... I think even "tooambitious" would agree.

I'm not talking about just graphic's calculators, any calculator which gives you an advantage over function keys (like sin, cos) and calculating values.

You need to read my previous post.

are you mr m's disowned son because you didnt get 100 ums in maths?

Wah really? But I integrated tan2x to lnsec2x, not 1/2lnsec2x.

Would I really only lose one mark?

Are you Mr M's son?

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Nah, I'm fine (Idont use one, so wasn't offended) but the insulation that only worse mathematicians would use one or that it is not dignified was harsh


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(1/2)(ln(root3)) should be fine, but you almost definitely would lose a mark on the substitution question if you gave the answer in terms of u.

Great work Benjy100

I've added brief amendments to your solutions in bold below.

If it's so 'unfair', then OCR can very easily put 'Graphic calculators are not allowed' on every paper. But until then, it's explicitly NOT cheating or unfair. As you said, why should some students confer an advantage because they can afford a graphic calculator? They clearly DON'T. OCR and every other exam board evidently(and clearly) agrees with me.

:P

Let's just stop this debate and just agree to disagree, I also have the M2 exam to swat up for! Unfortunately I may have butchered my chances of getting an A* in Further Maths by screwing up getting an A in FP3 - with the second order differential equation I forgot to carry through this particular x value on my particular integral, and so any succeeding general and particular solution was incorrect - at least 6 marks gone :-(

are you mr m's disowned son because you didnt get 100 ums in maths?

If it's so 'unfair', then OCR can very easily put 'Graphic calculators are not allowed' on every paper. But until then, it's explicitly NOT cheating or unfair. As you said, why should some students confer an advantage because they can afford a graphic calculator? They clearly DON'T. OCR and every other exam board evidently(and clearly) agrees with me.

Only one? That's a relief. Do you know if the answer was ln(u)-(1/u)?

I can't be sure without seeing the mark scheme, but your answer was pretty close, and the mark schemes usually contain "attempt to integrate...", so you'll definitely pick up marks. I would think you'd drop one, but as I said, I can't be 100% sure. Also, I did it a different way to you. I just realised it was f '(x)/f(x) and got -1/2 ln cosx, which is the same as 1/2lnsecx. I hope my method was allowed!

messed up FP3 too, damn it for easy papers. Made silly mistakes on both that and FP2 but FP2 boundaries will lower so it should still get an A* (I think I'm somewhere between 59and 63). I got 100 in S2 though, so I only heed to average 85 in two of FP2/3 and M2, thankfully


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In 7 i got AC as root(30) (miss typed on calculator hit 1 not 2...) and so got the angle and thus area of the pyramid wrong as a result? would i get follow through? (if so how many could i expect to lose for the original error 1-2?)

for both 4 i got pi/6 and 5pi/6 (missed pi/2) and didn't see it wanted co-ordinates ... lose 3/4?

for 9 again i got the y value y=3 but didn't explicity write the co-ordinates ... lose 1?

also i gave r= (2/3(3.24t+1.8))^2/3 would that lose marks? it didn't say to simplify?

Thanks very much x

For what it's worth, I think a lot of A level students would find this a tough paper; I'd expect the grade boundaries to be lower than average.