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# OCR C4 (not mei) 18th June 2013 revision watch

1. What did people get for the angle BAC or whatever it was?

At first I got 8. something, then I scribbled it out and had a three digit number with a 1 and 7 in it.
2. for question 8i) i got:
i)50r^0.5 = 9t + 105

anyone else get this or did i completely mess itup?
3. (Original post by Stickyelmo)
Intergrate tanx and you get ln(secx) I just guessed tan2x would be ln(sec2x) then normal stuff from there
That's what I did, but apparently it's not right and I didn't think it could be right either because it was worth 5 marks
4. THAT EXAM SHOULD HAVE BEEN MORE THAN AN HOUR AND A HALF! Didn't have time to freaking think! ugh
5. (Original post by Maid Marian)
What did people get for the angle BAC or whatever it was?

At first I got 8. something, then I scribbled it out and had a three digit number with a 1 and 7 in it.
I got thirty something... Some people got 171, but that doesn't make sense to me, because it's a triangle :s
6. (Original post by a10)
9.33 for the volume

30. something for the Differential Eq
Yes thats whay i got for the volume... glad i know i got something right.
7. (Original post by wandi)
THAT EXAM SHOULD HAVE BEEN MORE THAN AN HOUR AND A HALF! Didn't have time to freaking think! ugh
Yeah I struggled with the timing on this one. I usually have lots of time left at the end in maths exams, but I didn't today
8. (Original post by louise_234)
i put minimum but not sure, i worked out the gradient a point next to it and the gradient increased :s
PI put point of inflection
9. (Original post by Maid Marian)
What did people get for the angle BAC or whatever it was?

At first I got 8. something, then I scribbled it out and had a three digit number with a 1 and 7 in it.
Yeah I got something like that. 171.3 or something.

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10. (Original post by Maid Marian)
That's what I did, but apparently it's not right and I didn't think it could be right either because it was worth 5 marks
You had to divide it by 2 (dy/dx of 2x)
11. (Original post by Croydon'Stepper)
I got thirty something... Some people got 171, but that doesn't make sense to me, because it's a triangle :s
Hmm. Yeah I think 171 was what I got, but exactly how could that be right!

I just don't know ...
12. (Original post by AlesanaWill)
No there should be 3. I plotted it on a graphical calculator and there were 3.

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Yeah, I hope you're right. I can't see why there wouldn't be three?
13. (Original post by Maid Marian)
What did people get for the angle BAC or whatever it was?

At first I got 8. something, then I scribbled it out and had a three digit number with a 1 and 7 in it.
I got 8.something.

You did it again and got the negative. Both are right, because if you think, when two lines meet there is always an obtuse and acute angle. They didn't specify which they wanted, so mark schemes always allow both.

The only problem is which one is used in the volume equation, and I'm not sure about that one
14. (Original post by AlesanaWill)
Yeah I got something like that. 171.3 or something.

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Didn't it say acute angle, which would be 180-your answer? I put both down just in case
15. (Original post by ActaNonVerba)
You had to divide it by 2 (dy/dx of 2x)
I don't understand that? I don't understand why you have to divide by 2...
16. Isnt it slightly unfair people can plot the graphs using theirs calculators during the exam? :| "pay £80 and get a slight advantage. " Meh.
17. for the tan question my final integral was

and I subbed in values wrong for the first part so I ended up with

can someone confirm whether they the -6+4 root 3 part?
18. (Original post by metabalo)
for question 8i) i got:
i)50r^0.5 = 9t + 105

anyone else get this or did i completely mess itup?
I got something with r^(3/2) in it.
19. I can see grade boundaries dropping to about 50 for an A (52 is the lowest it's ever dropped)
20. (Original post by Croydon'Stepper)
I got thirty something... Some people got 171, but that doesn't make sense to me, because it's a triangle :s
I got 8.68

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