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OCR (non mei) C4 Friday 24th June 2016

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https://docs.google.com/document/d/1dCyj8Z7dUkuRi0kXC5FMKsV1M0QB0e8OM4Sndyea5Sg/edit?usp=sharing
Original post by _asha_
Can anyone remember how to get the Cartesian equation in question 9?
I got 2x^3 - 6x^2 + 5x but i don't think its right


You user x = 1-cost to get cost=1-x and then replace cost in the y=sintsin2t.

My finally answer was 2x^3-6x^2+4x which intersects the x-axis at (0,0) (1,0) and (2,0)
Original post by _asha_
Can anyone remember how to get the Cartesian equation in question 9?
I got 2x^3 - 6x^2 + 5x but i don't think its right


pretty sure it was y=2x^3 -6x^2 +4x, which then would factorise to:

y= 2x(x-1)(x-2)
Original post by Sid1234
if i didnt finish the last q and put ln(y) =(ln(1/144)+2) how many do you think ill lose?


1, 2 max
For the last questions, right before i got to the solution i did:

ln(y) = -ln(144) + 2
ln(y) +ln(144) = 2
this is where i went wrong:
i put: ln(y/144) = 2 and then went to say 144e^2 = y

Because i was rushed I ****ed up my log rules, so got the wrong answer (should have been y = 1/144e^2 )

how many marks would i lose?
Original post by Fucxucucu
Tbh last year ther was one hard question, the differential equations question, and the rest was extremely easy. This year the integration was really hard imo, not the hardest but still pretty bad.


It was similar difficulty not the same, I still made some errors. However, generally it wasn't the hardest paper.
Can anyone remember what the actual implicit differentiation question was?
Does anyone remember what q2 was?
what grade do people think 61 marks will be?
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btsx
1
oh well for the larr question i got 1/144 e^-2. how many marks do you think id lose?
Original post by M12345689
what grade do people think 61 marks will be?


Im thinking probably high A if we're lucky and the boundaries are low then perhaps sneaking into an A*
Original post by duncant
12.7 and 77.3?
all i can remember is that you found 2alpha so you have to divide wat eva 2 values you got by 2
to show they were the same line in the vector question, if I showed that both lines went through the same 2 points is that enough?
The implicit differentiation doesn't look familiar at all from that white paper mark scheme.
What exactly was question 2 and 3 again?
Original post by tavtavtav
The implicit differentiation doesn't look familiar at all from that white paper mark scheme.


Do you get a fraction within a fraction with 1/x^2
Anyone rememeber what the limits for question 4 were exactly??
Original post by TheNicholas
Do you get a fraction within a fraction with 1/x^2


Yeah i did. Had x^(-2) in the numerator
Original post by tmoss99
Yeah i did. Had x^(-2) in the numerator


Yeah mines the same, just time send though by x^2
Original post by TheNicholas
Yeah mines the same, just time send though by x^2

would you get full marks for not multiplying by x^2 or -1 mark?

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