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Edexcel C3 Jun 05 - How Did It Go? watch

1. (Original post by Goody1)
Aslong as you've got the right solutions aswell u cud rtight 30 answers and still get all the marks, they can't negative mark in a-levels so aslong as the correct solution is there technically u shudnt lose any marks
But giving an answer which lies out of a specified boundary is incorrect. I am sure you lose 1 mark for giving an answer which doesn't lie within the boundary.
2. hey what was the actual question for that q1...was it 2tan^2X + sec^2X = 1?
3. How many ppl on here would retake if they got a B or worse in the C3 exam?
4. (Original post by goku999)
How many ppl on here would retake if they got a B or worse in the C3 exam?
I probably would (as long as unis don't know) since c3 is easier than c4,fp1 and fp2 which i'll have to do next year.
5. Ok some complete and utter loser neg repped me (not a red gem, but a dark drown gem) twice, for telling me that i couldnt count. Apparently they disagree that one of the differential equations wasnt ^3 when 3 other people say it was.

Does this loser wish to own up........?
6. (Original post by goku999)
How many ppl on here would retake if they got a B or worse in the C3 exam?
im retaking a few units at university if i dont get an A
7. (Original post by melbourne)
im retaking a few units at university if i dont get an A

What would be the point once you're already at uni? Make your CV look better?
8. I need a C... (got 187 UMS for C1,M1 and S1)
I reckon I got about 55%, so I'm hoping for about the same UMS
9. hey what was the actual question for that q1...was it 2tan^2X + sec^2X = 1?
10. (Original post by nacero2000)
hey what was the actual question for that q1...was it 2tan^2X + sec^2X = 1?
No one seems to be able to remember. I don't think it had "2x" 's in. But I could be wrong.
11. (Original post by Widowmaker)
for differentiation, I got
sin2x + 2sec2xtan2x for first one
and 3(x+ln2x)²(1 + 1/x) (if the question was (x+ln2x)³ I can't remember to be honest)
For the differentiation one - i didn't know how much to simplify it by!!!
First one:
6sinxcosx + 2sec2xtan2x
giving you:
3sin2x + 2sec2xtan2x
giving you:
sin2x(3 + 2 sec22x)

lol, cant deduct marks for that surely!

and for the second one:

3(1+1/x)(x+ln(2x))2
giving you:
3(x + 1)(x+ln(2x))2
x

i finished the paper in 35 mins wooooooooo
12. (Original post by Zuber)
For the differentiation one - i didn't know how much to simplify it by!!!
First one:
6sinxcosx + 2sec2xtan2x
giving you:
3sin2x + 2sec2xtan2x
giving you:
sin2x(3 + 2 sec22x)

lol, cant deduct marks for that surely!

and for the second one:

3(1+1/x)(x+ln(2x))2
giving you:
3(x + 1)(x+ln(2x))2
x

i finished the paper in 35 mins wooooooooo
my answers are only guesses. i can't remember the question exactly or the answer I wrote down.
13. (Original post by Widowmaker)
my answers are only guesses. i can't remember the question exactly or the answer I wrote down.
i am quite sure its right (many ppl agree). its just that i never can tell what the mark scheme wants - i.e. how much should we simplify...so i just simplified as much as possible
14. (Original post by melbourne)
im retaking a few units at university if i dont get an A
I will retake if i get under 85 [probably got like 80]
15. (Original post by samdavyson)
I only got 3 solutions which were: 0, 131.8, 228.2.

If anyone can remember the question we can see who is right.

It was 0 to 360 (not including 360).

K_M: Thanks. That saves me a job.
I think I got three solutions as well.
16. (Original post by k10k)
I think I got three solutions as well.
it was definetly 0, 131.8 and 228.2
i had enough time to plug these numbers into the original formula and got it correct. only way to lose marks is if there are MORE solutions - but i dont see how that is possible
17. (Original post by Zuber)
For the differentiation one - i didn't know how much to simplify it by!!!
First one:
6sinxcosx + 2sec2xtan2x
giving you:
3sin2x + 2sec2xtan2x
giving you:
sin2x(3 + 2 sec22x)

lol, cant deduct marks for that surely!

and for the second one:

3(1+1/x)(x+ln(2x))2
giving you:
3(x + 1)(x+ln(2x))2
x

i finished the paper in 35 mins wooooooooo
I got those too.

(Original post by Zuber)
it was definetly 0, 131.8 and 228.2
For starters the answer was meant to be in radians. Secondly I'm positive 2.12 was one of the answers.
18. (Original post by Hash)
I got those too.

For starters the answer was meant to be in radians. Secondly I'm positive 2.12 was one of the answers.
heehee - there were 2 trig questions. and yes for the radians one i did get 2.12 (and 0). - again these are right as i plugged into equation.
19. i think for the one i was referring to (with 0, 131.8, 228.2), it followed the question where we had to prove one of the easiest rules of:
1 + tan²x = sec²x

cant remember the actual question though. something like this perhaps:

2tan²x + sec x = 1

giving you:
2(sec²x - 1) + sec x - 1 = 0
2sec²x + sec x - 3 = 0
(2sec x + 3)(sec x -1)=0
sec x = -3/2
cos x = -2/3
x = 131.8, 360-131.8=228.2

OR
sec x = 1
cos x = 1
x = 0, 360 (360 not in range)

(btw i did all this without a calculator right now - all from memory so i apologise for any mistakes)
20. (Original post by Zuber)
heehee - there were 2 trig questions. and yes for the radians one i did get 2.12 (and 0). - again these are right as i plugged into equation.

You're right. I remember now, and I agree with that answer

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