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OCR C4 (not mei) 18th June 2013 revision

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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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Oh yeah, and did anyone else not know what inversely proportional meant? I completely forgot :frown::frown::frown::frown:
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? :s-smilie:
Reply 443
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mrmccarl
what do reckon for grade boundaries guys? and for c in the differential equation...did you get 9 over 5?
Reply 444
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Benjy100
5
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 :smile:


I made one on page 21
Pyramid whaatttttt ?? Didn't read there were two stationary points to find, only found one :frown: failed t that
Original post by maid marian
oh yeah, and did anyone else not know what inversely proportional meant? I completely forgot :frown::frown::frown::frown:

aah great. Didnt read that. Few more marks gone. Kill me.
Reply 447
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94Singh
Original post by Maid Marian
But it was tan2x?

Did that not make a difference? :s-smilie:


it went to 1/2ln(sec2x)
Original post by Maid Marian
Oh yeah, and did anyone else not know what inversely proportional meant? I completely forgot :frown::frown::frown::frown:


1/(r)^1/2
Reply 449
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SJ12345
Original post by AlesanaWill
Integral of tan x is in the formula book?

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Yeah but it was tan2x
Reply 450
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SJ12345
Original post by 94Singh
it went to 1/2ln(sec2x)


OMG! I've done 1/2lnsecx instead of lnsec2x. Now I'm depressed
Original post by 94Singh
it went to 1/2ln(sec2x)


Nooooooooooooooooooooooo! I just did lnsec2x, no 1/2.

*sobs*
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 :s-smilie:
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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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
So whose making the hitler clip :P
Omdz how can my mind forget how to do intergration by parts :angry:.. 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
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.
Reply 458
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metabalo
for question 8i) i got:
i)50r^0.5 = 9t + 105

anyone else get this or did i completely mess itup?
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 :s-smilie:

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