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Edexcel A2 C3 Mathematics 12th June 2015

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I have done most of the c3 papers and to my knowledge factor formulae has never come up (I might be wrong though so dont hold me to that)

What is the factor formula????

Reply 1841

Gilo98

Original post by BBeyond

****ing tell me about it, i'm lit hopeless at it there must be some easy way of doing it i can't visualise ****, especially when im trying to do the arcsin/tan/cos graphs i havent got a clue

its ****ing horrendous - if i cant just sway values in coordinates and 'see' the new shape I'm *******ed. For me its when the original graph goes through y=x; in which case i have no hope

Reply 1842

AbubakarB

Original post by BBeyond

how the **** do i reflect in the line y=x this is the hardest thing in c3 for me atm lol

say there's a point (1,0) on the y-axis:
y=x.jpg

draw the line y=x then at every point do a sort of right angle, i hope i made it clear

lol thaaaaaanks!!!!!

Original post by ThePrestigeUK

When its Rcos(x-alpha)

Do we work out alpha the same as Rcos(x+alpha)

I swear in the morning I thought we flip for minus, but now just done an example lost 6 accuracy marks FFS

pls someone help me out

You have to use the formula for cos (x-a) rather than for cos(x+a)

Reply 1845

mechanism

Original post by Viggi

guys just wondering (and panicking!) how much integration do we need to know for this (C3) because Exam solutions doesn't have a section on integration... :s-smilie:

I haven't seen an integration paper in C3! They won't be testing us on this, don't worry.

Reply 1846

kajo

Original post by Freddy-Francis

June 2014 R paper is disgusting :redface:

Just did that paper, even looking at the mark scheme I couldn't work out what I'd done wrong with some of the questions

Reply 1847

adorablegirl1202

Original post by Maham88

x/QUOTE]

hey you know for jan 2010 9iib i get the range is greater than 3 but why is it not greater than and equal?

Reply 1848

DesignPredator

No regulations say you can't bring a mirror in :wink:

Reply 1849

physicalgraffiti

Does anyone know how to do 9c on last year's C3 paper? I got the maximum value but I have no idea how you work out the minimum.. I don't get how you're supposed to work it out.

Reply 1850

BBeyond

Original post by Gilo98

its ****ing horrendous - if i cant just sway values in coordinates and 'see' the new shape I'm *******ed. For me its when the original graph goes through y=x; in which case i have no hope

dont even im normally already long ****ed before that point, may have to resort to the plotting technique tbh but thats so long

Reply 1851

Vesniep

Original post by Gilo98

thought you'd say that :wink:

Me too, praying for a bastard of a paper. June 2013 wasn't really that hard for me and 100ums was so low...

oh june 2013 was really good paper.75/75 was not that difficult to achieve no matter how low the 100UMS boundarie was.If only tommorow the paper is more difficult than June 2013. That would be great!

Reply 1852

Freddy-Francis

Original post by avninsa

Can anyone explain how bii and c are done? Mark scheme isnt helping much

is bi) is max value the value of R?
this is when cos(theta + alpha) =1
so R(1) = max
R =max
ii) check the cos graph. look at where it is 1 on the graph

So from the graph. It is max at points 0, 2pie

so make it equal to the equation and solve for both values.

I think. Someone correct me

Reply 1853

suyoof123

Original post by DesignPredator

No regulations say you can't bring a mirror in :wink:

Or bring tracing paper :colone:

Reply 1854

Hudl

June 13 R paper help on Q3c anyone ?

ImageUploadedByStudent Room1434054380.582274.jpg

From 0 - 360 degrees there is only one point where cos is -1 so I though the answer would be -5root2 using the R harmonic trig but it isn't can someone help me as I don't even get how they got the answer to that

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Reply 1855

frozo123

omg I think I discovered a new identity!
tantheta=1/tan90-theta
lol

Reply 1856

Freddy-Francis

Original post by kajo

Just did that paper, even looking at the mark scheme I couldn't work out what I'd done wrong with some of the questions

lol. same. Just destroyed my happiness :s-smilie:

I was like wtf.

Guys any recommended papers?

Reply 1857

Vesniep

Original post by Viggi

guys just wondering (and panicking!) how much integration do we need to know for this (C3) because Exam solutions doesn't have a section on integration... :s-smilie:

Just remember to check your answer with the calculator and everything will be fine.C3 doesn't require something new in integration.

Reply 1858

Gilo98

Original post by BBeyond

dont even im normally already long ****ed before that point, may have to resort to the plotting technique tbh but thats so long

hopefully the table function on my calc and some praying tonight will get me through it!! Cant believe some people can just 'see' it - even with a ****ing mirror doing SATS i could never do reflections - the only ones I'm fine with are reflections in the axis when the graph doesn't go through them :mmm:

Original post by Vesniep

oh june 2013 was really good paper.75/75 was not that difficult to achieve no matter how low the 100UMS boundarie was.If only tommorow the paper is more difficult than June 2013. That would be great!

ikr, got 70/75 because of the tan Q and not seeing the similar triangles approach to the functions Q (the hardest Q on paper imo). Praying for smoothening similar