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# Edexcel C2 20th May 2015 *Official Thread* watch

1. (Original post by Haych97)
Wouldn't you use the formula Arc length=r(theta)
So that would be 7x0.8
sorry i mean 7c
2. (Original post by ToLiveInADream)
Sorry! I didn't know people were confused :/

http://www.physicsandmathstutor.com/...rs/c2-edexcel/

Scroll down, there will be June 2013/14 IAL/R papers so that's 4 more papers to do. They're usually harder so don't worry too much if you get a bit under your usual marks.
Thanks.
3. (Original post by rem19)
"3xlog2 = 3log2 + xlog2" is this a log rule?? I didn't know you could do that?
2(3^x) is the same as multiplying so it's log2 + log3^x then you can take the power down so it's log2 + xlog3
4. (Original post by userxx990)
Anyoneeee??
Pretty sure that's a C1 queston. Anyway, you have rationalise the surd
5. (Original post by leoben49)
what's the difference between an r paper and a normal one? and why is it harder?
trickier numbers
less marks for the same working out
most questions are not straight forward.
this wont be true though, they are only used for time zones
6. Hi has it seriously not been leaked? I can't find anything!
7. (Original post by leoben49)
Pretty sure that's a C1 queston. Anyway, you have rationalise the surd
okay, how to solve this interval using trignometry ?
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8. (Original post by Vishwa98)
Hi has it seriously not been leaked? I can't find anything!
who cares if it's leaked or not? just do the exam to your best ability, the boundaries will alter to the difficulty of the paper
9. Do we need to know how to do algebraic long division of polynomials by linear functions? It's mentioned on the specification but I've never seen a question on it in any past paper.
10. (Original post by userxx990)
okay, how to solve this interval using trignometry ?
cos^2x is (1-sin^2x)
so sub that in, multiply out brackets
11. Yeah but still just wanted to know if it has or hasn't
12. (Original post by Oz_Vessalius)
Do we need to know how to do algebraic long division of polynomials by linear functions? It's mentioned on the specification but I've never seen a question on it in any past paper.
what like? 2x^3-10x^2+4x+2 divided by 4x+1 ?
yeah you need to know how to do that
13. (Original post by Olon)
sorry i mean 7c
D is the midpoint therefore it would be 3.5 for DC
You have already worked out arc length
Then you would use the Cosine Rule to work out the length of BD
Hope this helps!
14. can some explain the exact cast diagram method they would do for this question 7a i
15. For geometric series with problems such as money, sometimes is see that you have to use ar^n-1, whereas other times is see that you just have to use ar^n. Is there a clear way of being able to tell which on to use?
16. (Original post by frozo123)
cos^2x is (1-sin^2x)
so sub that in, multiply out brackets
Alriggghtt ill try can u tell me this one?
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17. For trig questions in C2 how would you find other values for sin cos and tan? How do you know what to do to find the other values

thanks
18. (Original post by LearningGeek)
can some explain the exact cast diagram method they would do for this question 7a i
let the bracket thing equal a variable solve that variable like normal
tan is positive between the 180 and 270 quadrant and the 0-90 quadrant

okay then you subtract 180 from your answers, then you add on whatever is in your brackets
19. jus the u61, how is it 3?
20. (Original post by Vishwa98)
Yeah but still just wanted to know if it has or hasn't
Instead of wasting time trying to find 'leaked' papers, put this time to use..
Anyway, why would you want to cheat? Maths is so much fun!!!

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