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# Edexcel C3 June 2016 - Unofficial Mark Scheme

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1. (Original post by eyeman567)
Yeah I think it was that, I don't get how you solve it though

I subbed G into F

Got 28 / (x-2) = x + 1

Then ended up with X^2 - x - 30 = 0

which Im pretty sure is wrong and unsolvable
(x-6)(x+5)=0
x=6
x=-5
3. What was the gradient for 6b
Same here
They changed the sign from cos - sin something to cos + sin, on the bottom of the fraction so you had to reverse this in Rcos(x-26.57)
5. I don't remember the first question what were the numbers?
6. What was the question for 5i? Sure I got an answer of 0.9016 or something
7. I got 8cosec(4y), apart from that I agree completely
Wait I'm dumb I forgot to flip the 4 to 1/4 when doing dx/dy -> dy/dx
8. how do you do question 5 a and b?
9. (Original post by eyeman567)
Yeah I think it was that, I don't get how you solve it though

I subbed G into F

Got 28 / (x-2) = x + 1

Then ended up with X^2 - x - 30 = 0

which Im pretty sure is wrong and unsolvable
(x+5)(x-6)
10. (Original post by gh2)
They changed the sign from cos - sin something to cos + sin, on the bottom of the fraction so you had to reverse this in Rcos(x-26.57)
Crap.
11. How many marks was 5ii? I think I differentiated it to 4Sin2YCos2Y and then I got 0.5Cosec2Y for my final answer because I forgot to double the angle
12. Can someone post the method for the question where there was long division and finding the equation of the normal? I know my answer is wrong but I don't know how and I'm hoping I didn't lose all those marks
13. (Original post by eyeman567)
Yeah I think it was that, I don't get how you solve it though

I subbed G into F

Got 28 / (x-2) = x + 1

Then ended up with X^2 - x - 30 = 0

which Im pretty sure is wrong and unsolvable
(x-6)(x+5)? maybe use the quadratic formula to check next time
14. For q2 was it x<-root5 and x>root5 for dy/dx<0
15. Does anyone remember how many marks each question was worth?
16. For the arc sin i used 90 and -90 degrees instead of half pi would i lose a mark for that?
17. (Original post by Pyslocke)
For q2 was it x<-root5 and x>root5 for dy/dx<0
Yep - that's what I got anyway
18. What do you guys think the grade boundaries will be?
19. (Original post by theereflex)
For 3(c), I don't understand why the lowest value of theta wasn't just 33 from part b?

anyone help?
It was the same but it had PLUS sin rather than MINUS sin
20. (Original post by Kay_Gupta)
How many marks was question 6b out of?
I think it was out of 4

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