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# Edexcel C3 June 2016 - Unofficial Mark Scheme

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1. veldt127 Is there any chance you can explain / show us working for question 7b)? I thought I got the answer at the time but I seem to remember my answer being different to yours - the question was to solve
3g(x+1) + 1 = 0
with g(x) = arcsinx
if I remember correctly? Thank you - and thanks so much for your answers, they're great!
2. Someone needs to get the actual paper up ASAP so everyone can establish the ranges in the trig questions. I will give an infinite number of rep using an infinite number of accounts to anyone who could possibly upload pictures of the paper. I'll even pay \$. If you want \$ PM me.
3. (Original post by Linguist131)
veldt127 Is there any chance you can explain / show us working for question 7b)? I thought I got the answer at the time but I seem to remember my answer being different to yours - the question was to solve
3g(x+1) + 1 = 0
with g(x) = arcsinx
if I remember correctly? Thank you - and thanks so much for your answers, they're great!
Here you go! It was 3g(x+1) + pi = 0
4. does anyone know how many marks each questions is worth?
6. what was question 6 about again?
7. (Original post by veldt127)
Here you go! It was 3g(x+1) + pi = 0
Yep, that was it, thanks! I'm so annoyed - I think I wrote x = sin (pi / 3) when I converted it from arcsin and just missed out the 1 which is so irritating! Oh well, fingers crossed I only lost 1 or 2 marks for something that stupid - thanks
8. (Original post by eyeman567)
what was question 6 about again?
Long division, then finding a normal to the a point on the equation you found at the start.
9. Can someone explain how to do question 5a?
10. (Original post by Narxs)
I did 4e^2x =25
e^2x=25/4
2x=ln(25/4)
x=0.5ln(25/4)

But didn't simplify ant further would this be alright??
Just 1 mark you lose
11. (Original post by Ayagh)
Hi I think that is the one where you had 0=e^2x(3sintheta - 4costheta)

Something like that.
Then you end with tantheta = 3/4 or something.
12. (Original post by veldt127)
Here you go! It was 3g(x+1) + pi = 0
Correct
13. (Original post by veldt127)
Here you go! It was 3g(x+1) + pi = 0
I left it at sin(-pi) + 1 = x would i lose a mark for that?
14. (Original post by Kay Fearn)
I left it at sin(-pi) + 1 = x would i lose a mark for that?
15. (Original post by unimaginable118)
Does anyone remember how many marks the last question was? I was SO STUPID. I left it out (( looks like someones not going to uni...
Dont worry, it was like 8 max
16. (Original post by veldt127)
yes that's what i mean, would i lose a mark for leaving it like that?
17. (Original post by Kay Fearn)
yes that's what i mean, would i lose a mark for leaving it like that?
Possibly 1 or 2 for not finishing the answer; you'll definitely get method marks
18. If you put 2cosec4y but did all working out correct how marks would you lose and what do people think an A will be?
19. (Original post by veldt127)
Possibly 1 or 2 for not finishing the answer; you'll definitely get method marks
Yeah but i just left it as it's exact value, i thought that's what you had to do when it came to stuff with pi :-(
20. (Original post by strud1e)
LHS:
2/tan2A +tanA
2(1-tan^A)/2tanA +tanA
(1-tan^2A+tan^2A)/tanA
1/tanA
AH I was going to try it that way, but I did it the other way by making the cot into cos/sin and doing it all from there.. sigh

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