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# OCR (not MEI) C2 - Wednesday 20th May 2015 Watch

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1. (Original post by Lil_timmi)
Attachment 403833

This is how I answered 7. iii)

Can someone tell me where I went wrong???

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This is how I did it

La vie? C'est la vie.
2. would I lose a mark if I didn't put dx after the integral in the double differential thing?
3. I think I have made some mistakes on question 3 where I can't remember if I have used cosine rule at all... Can someone show me how to get the correct answer for question 3 please?
4. (Original post by study101)
would I lose a mark if I didn't put dx after the integral in the double differential thing?
dont think you would
5. (Original post by andygeor)
dont think you would
okay I hope I don't :/ thank you!
6. I thought you took it from 6pi as the graph is stretched by a scale factor of 3 unless I'm wrong, but now I am unsure
7. (Original post by ayl21)
I thought you took it from 6pi as the graph is stretched by a scale factor of 3 unless I'm wrong, but now I am unsure
tan graph isnt symmetrical so can't take from 6pi. as they repeat every 180 degrees or pi radians with just normal tan(x) so you need to add on 3pi radians to the first value because its tan(1/3 x)
8. Your marks add up to a today of 74, I am pretty sure the N=24 question was worth 4 marks
9. (Original post by sarahowl)
Haha I did this too, the panic of exams does some very strange things...
(Original post by jamesplay73)
I know yea haha, I just had no time left thank you anyway
Hahah ok fair enough, at least you guys didnt write the wrong answer, that's all that matters
10. (Original post by andygeor)
tan graph isnt symmetrical so can't take from 6pi. as they repeat every 180 degrees or pi radians with just normal tan(x) so you need to add on 3pi radians to the first value because its tan(1/3 x)
I didn't use the tan graph, I squared both sides instead and used the cos graph
11. last answers were 3.32 and 15.5, anyone?
12. I understand how to solve it using tan, I'm just trying to see where my second answer of 6.1 rad comes from... I'm kinda frustrated at how I've lost so many marks because I didn't notice that you could use tan

Thanks everyone for the help though

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13. (Original post by ChoccyPhilly)
last answers were 3.32 and 15.5, anyone?
Yeah I got something along those lines, how did you get the 15.5 answer?
14. (Original post by ayl21)
I didn't use the tan graph, I squared both sides instead and used the cos graph
i think (or what i did anyway) what you had to do was divide both sides by cos(1/3 x) and get 2=tan(1/3 x). not sure if it'd give the correct answers to square both sides but i may be wrong
15. (Original post by arabinthemist)
Used my fp1 knowledge for that question :P. I thought it was a paper that required you to be careful, but otherwise was quite straight forward. I know i've lost all my marks on the last question cus of radians smh
Yeh should have done that :/. I tried to insert N as a which is why it all went to hell but yeh, because the steps were right, just with completely the wrong numbers and idea, I think I may scrape a couple of marks there which would make the difference. Rest of straightforward so long as you checked well. What did you do for the last question? Answered it all in terms of degrees?
16. Btw I checked on my graphics calculator and the answer is around 3 and 12 (ie I'm wrong)

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17. (Original post by ayl21)
Yeah I got something along those lines, how did you get the 15.5 answer?
They intersect at 2 points, right? Although I might has taken it away from 2pi.

Oh well, this exam didn't mean anything for me
18. (Original post by Lil_timmi)
Btw I checked on my graphics calculator and the answer is around 3 and 12 (ie I'm wrong)

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for which question?
19. (Original post by ChoccyPhilly)
They intersect at 2 points, right? Although I might has taken it away from 2pi.

Oh well, this exam didn't mean anything for me
Yeah man that's exactly what I did, feel better now someone else did what I did haha
20. (Original post by ChoccyPhilly)
for which question?
The last part of the last question

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Updated: August 19, 2015
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