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Edexcel A2 C3 Mathematics 12th June 2015

Reply 2680

DesignPredator

9

Original post by Maths degree

What was the answer to why they can't be an inverse function of g(x)

Because g(x) is a many to one function and thus cannot have a inverse.

Reply 2681

johntoby

4

The question asking whether it was increasing or decreasing: I put decreasing, because it was a transformation of 1/x and k was a negative constant and x>=1

Reply 2682

Kabulkid

10

Original post by big fat poo

I did so crap on my D1 i got 60 UMS I reckon so I needed 180UMS more to get an A*, thats not happening now

clearing for you mate

Reply 2683

Kill3er

OP

13

Original post by `God

very easy paper, expect very high grade boundaries.

won't even be surprised if its 73 for A*/90UMS.

I predict:

75 -100
73 -90
70 -80
who cares about the rest

Nah fam, that's too low.

Reply 2684

Hectors

5

I found this paper much easier than the June 2014 one, anyone else agrees? I think the grade boundaries will be fairly standard? Also to prove cos theta on q1b I used a right angled triangle with hypothenuse sqrt(1+p^2) but when writing down the answer I copied the hypothenuse value wrong to get 1/sqrt(1-p^2). Would I get any method marks?

Reply 2685

Kabulkid

10

Original post by jennyh1

Made a couple of silly mistakes but found it fine, hopefully I got the 90 ums

highly doubt that, stop dreaming.

Reply 2686

Chazley123

2

for temperature question, I got lambda = ln(0.5)/-40 ?

Reply 2687

andysharp

1

Original post by lukass

for 8b) where

sec 2y + tan 2y = 1

how did people do this?? I was so confused...

Sub in the 'show that' value from part a) for sec2y + tan 2y then it's pretty simple from there

Reply 2688

Rushad

Original post by lollipopsftw

patiently waiting for Arsey

Im a noob here. Who is this arsey?

Attachment not found

Original post by anndz3007

Here is my answer, in random order th
2p/1-p^2,1/(1-p square)^1/2, (p+1)/1-p
Ln7/2,ln3/2
51.8,-25.3
K>33/8
Coordinate=( 0,pi/3)
93 sec
3.1,13.9
-4e^-4<y<1/e something
Fx Decreasing

I got k<-2root5 and k>2root5 as it is above and below the max and min point
yh it was -4e^-4<=g(x)<=1/8e
fx is increasing
other than that seems right

Reply 2691

LukeTownsend123

2

You're not a member of The Student Room if you don't know Arsey. :smile:

Reply 2692

subject1

18

My teacher said that it was quite easy for C3 (compared to last year and the year before) so expect high grade boundaries!

Reply 2693

Kill3er

OP

13

Original post by Kabulkid

IT WAS EASY BUT NOT THAT EASY, i predict

75 - 100
72 - 90
68 - 80
lol if u get below an A get off TSR

75 - 100
74 - 0

Reply 2694

xyzmaster

8

Original post by Nightmare8

That's because you need 270/300 from c3 c4 and fp2 for an A*. That's for further, I don't know about the rest

He's not doing further pure math. He's doing further math which is different.

Reply 2695

BFP=big fat poo

2

Original post by `God

very easy paper, expect very high grade boundaries.

won't even be surprised if its 73 for A*/90UMS.

I predict:

75 -100
73 -90
70 -80
who cares about the rest

Mate I totally agree with you, like that paper was p*** easy I could have done that while asleep. Actually I could have done it while doing C4 too, that's how easy it was.....STFU^^ and GTFO

Reply 2696

falconinni

1

Original post by Hectors

I found this paper much easier than the June 2014 one, anyone else agrees? I think the grade boundaries will be fairly standard? Also to prove cos theta on q1b I used a right angled triangle with hypothenuse sqrt(1+p^2) but when writing down the answer I copied the hypothenuse value wrong to get 1/sqrt(1-p^2). Would I get any method marks?