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

1. (Original post by g33kym0nk3y)
3) Skew
4) (pi/2 ,1), (pi/6 , 3/2)
5ii) 1/2 ln (root 13)
cant remember the question: (0,3)

Some of the answers i remember...
I got 0,3 for something as well!

But for number 4 my y values were the same as each other (though I can't remember what it was)... another question down the drain.
2. (Original post by Maid Marian)
I got 0,3 for something as well!

But for number 4 my y values were the same as each other (though I can't remember what it was)... another question down the drain.
Relax, I probably got it wrong... My life sucks anyways.
3. (Original post by Maid Marian)
Oh yeah, I messed up that question. Had a total mindblank.

Somebody enlighten us?
Integral of tan x is in the formula book?

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4. Oh yeah, and did anyone else not know what inversely proportional meant? I completely forgot
5. (Original post by AlesanaWill)
Integral of tan x is in the formula book?

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But it was tan2x?

Did that not make a difference?
6. what do reckon for grade boundaries guys? and for c in the differential equation...did you get 9 over 5?
7. (Original post by katherinej.)
Just come out of the exam I think it went well, has anyone got a markscheme so I can look at it please
I made one on page 21
8. Pyramid whaatttttt ?? Didn't read there were two stationary points to find, only found one failed t that
9. (Original post by maid marian)
oh yeah, and did anyone else not know what inversely proportional meant? I completely forgot
aah great. Didnt read that. Few more marks gone. Kill me.
10. (Original post by AlesanaWill)
Integral of tan x is in the formula book?

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The only time I've ever used the formula booklet!

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11. (Original post by Maid Marian)
But it was tan2x?

Did that not make a difference?
it went to 1/2ln(sec2x)
12. (Original post by AlesanaWill)
Integral of tan x is in the formula book?

Posted from TSR Mobile
Yeah but it was tan2x
13. (Original post by Maid Marian)
Oh yeah, and did anyone else not know what inversely proportional meant? I completely forgot
1/(r)^1/2
14. (Original post by 94Singh)
it went to 1/2ln(sec2x)
OMG! I've done 1/2lnsecx instead of lnsec2x. Now I'm depressed
15. (Original post by 94Singh)
it went to 1/2ln(sec2x)
Nooooooooooooooooooooooo! I just did lnsec2x, no 1/2.

*sobs*
16. (Original post by Maid Marian)
I got 0,3 for something as well!

But for number 4 my y values were the same as each other (though I can't remember what it was)... another question down the drain.
I got the same y values too
17. (Original post by Vip3rgt9)
Yeah see this is what I thought, but I plotted the graph on an online plotter and there's only two. Why is this?
No there should be 3. I plotted it on a graphical calculator and there were 3.

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18. (Original post by Maid Marian)
Oh yeah, I messed up that question. Had a total mindblank.

Somebody enlighten us?
Intergrate tanx and you get ln(secx) I just guessed tan2x would be ln(sec2x) then normal stuff from there
19. So whose making the hitler clip :P
20. Omdz how can my mind forget how to do intergration by parts .. made u=x^8 and it went AWOL lol (I know u=ln3x, but couldn't think) and forgot to half the base of the pyramid ting lol... Question 10 was a brain teaser but I got it after a while (x=0.1).. but how did people do part i) of 10.. That bamboozled me still

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