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# OCR C3 (not MEI) Official Thread - Tuesday 21st June 2016 Watch

1. (Original post by HecTic_H)
Going to guess:
41 - C
47 - B
53 - A
59 - A*
Really difficult paper imo.
I don't think they'll be that low, a little bit higher maybe 55-A?
A*-62 A-56 B-49 ?
3. (Original post by daniellon)
is the new equation x(-2x+5) and -cos*-1(-x)?
Yeah
4. For the integration question i found the area of trapezium and then substracted the area underneath the curve from it.

how many marks will i get
5. (Original post by connorbarr)
sinBsec^2B=27cosBcosec^2B?
Yes thats the one thanks! I messed up somehow and got tanB = 27 😭
6. What was the question for where everyone is getting pi/6? Like what did the question ask again?
7. (Original post by mil88)
I got all but 81.92 part.

I got 65.5.. and thus 66.
Greater than or equal to 3a
8. What did people get for the number next to t in question 3 so then they could find the mass?
9. I am pretty sure f(x) >= 3a because it was mod(2x + a) + 3a so if x = -1/2a you get f(x) = 3a
10. Hi,
What was question 9iib?
11. (Original post by underestimate)
Hi,
What was question 9iib?
pi/6
12. (Original post by Agent47_)
pi/6
What did we have to find out, like the equation given
13. Can anyone remember the 1st equation you had to integrate in Q2?

Think it was something like (4-1/x)^5

If so, wouldn't the answer be x^2/6(4-1/x)^6...with no ln ?
14. (Original post by underestimate)
What did we have to find out, like the equation given
It was something like sin4x(tanx + cotx) = 1

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15. (Original post by jonnydowe)
For 2i), it says these two equations are equivalent, are they? I got the second one through integration by inspection and I'm still concerned they're not.
Anyway, if not I'm at 69/72 I think. Hope that's 100ums but you can never be sure. Hoping C4 will be solid now.
16. (Original post by GM16)
It was something like sin4x(tanx + cotx) = 1

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Thank you!
17. (Original post by zintanax)
For the one about modulus, I only got 1 answer as x = 1.5a because when you draw the graphs they only intersect once - did anyone else get that?
I did this! I discredited the second answer (I tried subbing it back in but it didn't work so thought it must be invalid).
18. (Original post by Agent47_)
pi/6
Thanks!
19. If I wrote all real values for y for the range do I get any marks?
20. Plugging pi/6 into a calculator gives 2, not 1, it was 0.6something

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