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Edexcel A2 C3 Mathematics 12th June 2015

Reply 1860

BioAgent

10

how does theta = arcsinx turn to x=sin theta?

Reply 1861

s.c.a1

10

Original post by Freddy-Francis

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

I was like wtf.

Guys any recommended papers?

edexcel gold paper (g4 - hardest of all the past q's in one paper) otherwise the june&jan 13 are good practice too

Reply 1862

Gome44

10

Original post by BioAgent

how does theta = arcsinx turn to x=sin theta?

What? Just sin both sides

Reply 1863

Nurishment

2

Original post by Gome44

What? Just sin both sides

I'm sure he was just joking lol. I hope so..

Reply 1864

username1226161

15

Original post by JizzaStanger

set the two functions equal to each other to get an equation for their points of intersection. It should be a quadratic in x. Since they curves are tangential, you know this equation only has one solution. This means the discriminant of the equation is zero. You'll then get an equation you can solve for k.

I don't understand what you mean here?

Reply 1865

MrBowcat

10

Original post by Freddy-Francis

June 2014 R paper is disgusting :redface:

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

I just did that paper and got full marks.

Spoiler

Reply 1866

Viggi

1

so, we still need to remember previous integration stuff from C2 and C1 - like area under a curve? we just didn't need to learn anything new?

Reply 1867

Freddy-Francis

9

Original post by MrBowcat

I just did that paper and got full marks.

Spoiler

lol xD

Reply 1868

Gome44

10

Original post by Nurishment

I'm sure he was just joking lol. I hope so..

Ah, you never know with some people. Someone on the m2 forum said they didn't know what limiting friction was...

Guys any tips?

Anyone got any ridiculously hard c3 questions I can have a go at? (which aren't from real past papers, since I've done them all too many times now xD, espcially June 13...)

Reply 1871

Ripper Phoenix

17

Original post by s.c.a1

edexcel gold paper (g4 - hardest of all the past q's in one paper) otherwise the june&jan 13 are good practice too

g4 was easy! just than june 13 question ugh question 3

Reply 1872

Medicjug

2

Original post by JizzaStanger

set the two functions equal to each other to get an equation for their points of intersection. It should be a quadratic in x. Since they curves are tangential, you know this equation only has one solution. This means the discriminant of the equation is zero. You'll then get an equation you can solve for k.

What paper is this from?

Posted from TSR Mobile

Reply 1873

mb_12

1

Original post by BioAgent

how does theta = arcsinx turn to x=sin theta?

I think it is easier to look at it like this:
sin(theta) = x
theta = sin^-1(x)
theta = arcsin(x)

Reply 1874

Nashaa

Original post by toddle1

Has anyone got an easy way to remember transforming graphs? Like what to do when it's af(x) or f(ax)

Inside the brackets changes the x coordinates and does the opposite of what you expect. Eg. f(2x) you divide by 2, f(x+3) you move left 3.
Outside the brackets changes the y coordinates and does what you expect it do to. Eg. 2f(x) the y coordinates multiply by 2, f(x) + 3 you move up 3.

Reply 1875

suyoof123

2

Original post by mb_12

I think it is easier to look at it like this:
sin(theta) = x
theta = sin^-1(x)
theta = arcsin(x)

Please dont tell me we have to learn those weird arc cos,sin, tan graphs....

Reply 1876

Gome44

10

Original post by lightningdoritos

I don't understand what you mean here?

I'm not sure this is correct, the tangent will intersect the curve in 2 places. You know a and k are postive, so you know the tangent is on the -f(x) side (just imagine the graph). Differentiate and do it normally :smile: