Edexcel A2 C3 Mathematics 12th June 2015 Watch

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lightningdoritos
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#1881
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#1881
(Original post by Gome44)
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
That's what I thought because if you put the b^2-4ac equal to zero you get have to sqrt a negative which you can't do
However, on my diagram the curves only intersect once? Does the "tangent" part of the graph count as an intersection too?
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Medicjug
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#1882
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#1882
(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.
Is this a Solomon paper?


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Gome44
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#1883
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#1883
(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)
The problem with going that way around as opposed to the previous way is θ could also be π-arcsin(x), there is not one specific solution. Anyway, that's just being nit picky
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nbofni
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#1884
(Original post by Rimzzzzz)
have you even revised for this exam?!
no integration at all!
Lol, viggi mate, you're screwed if start integrating on a c3 paper xD.
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suyoof123
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#1885
(Original post by Gome44)
You do
Out of the 6-7 pp's i've done, they havnt come up.

Do you know how they are relevant in terms of what can be asked.
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Gome44
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#1886
(Original post by lightningdoritos)
That's what I thought because if you put the b^2-4ac equal to zero you get have to sqrt a negative which you can't do
However, on my diagram the curves only intersect once? Does the "tangent" part of the graph count as an intersection too?
Yes
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MrBowcat
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#1887
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#1887
(Original post by Freddy-Francis)
Guys any tips?
Yeah tip of this d****.





HA GOT EEEEEEEM
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paradoxicalme
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#1888
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#1888
(Original post by adorablegirl1202)
hey you know for jan 2010 9iib i get the range is greater than 3 but why is it not greater than and equal?
Does it involve e^x? Then e^x can never equal 0

(Original post by Gome44)
Ah, you never know with some people. Someone on the m2 forum said they didn't know what limiting friction was...
To be fair, we never got taught the term limiting friction, it was always limiting equilibrium, although it should have been pretty clear
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lightningdoritos
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#1889
(Original post by Gome44)
Yes
yay thanks!
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BBeyond
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#1890
(Original post by Gilo98)
:rofl: 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:


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
how do you do it on your calc?

didnt u just get 2 equations for the lines for that q? (at least i did)
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Gome44
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(Original post by suyoof123)
Out of the 6-7 pp's i've done, they havnt come up.

Do you know how they are relevant in terms of what can be asked.
That means there's a high probability of it coming up this year. You'll probably just be asked to sketch the graph and maybe use transformations with them
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WillGood
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#1892
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#1892
Guys i am going to share with you identies that you must know that are not included in the book

Take ∞ as Theta

Sin(90 - ∞) = cos(∞)
Cos(90 - ∞) = sin(∞)

Here are the practice Questions that envolve these identities:

June 2013 Q3

I found out about these today from teacher. Have fun, sorry for the last minute notice but I hope I helps.
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Medicjug
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#1893
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#1893
(Original post by TeddyKC)
Could someone help with this beast of a question?
(Part b)
Attachment 425815


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Hey what paper is this from I can help you with the first part but I need to see the mark scheme for the second bit


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H0PEL3SS
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#1894
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#1894
(Original post by Nashaa)
Anyone think the paper tomorrow will be as disgusting as last year's paper? It was literally the worst paper I think I've done.
If you think that was bad, take a look at June 2013. It was 69 for the 100 IIRC..
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Gilo98
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#1895
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#1895
(Original post by BBeyond)
how do you do it on your calc?

didnt u just get 2 equations for the lines for that q? (at least i did)
theres some table function. shift mode something - gives you a table of values - plot points and see the shape then

you were meant to use similar triangles - just couldn't see how i was expected to get the answer - also missed the sneaky second solution to the last part
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BBeyond
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#1896
(Original post by Gilo98)
theres some table function. shift mode something - gives you a table of values - plot points and see the shape then

you were meant to use similar triangles - just couldn't see how i was expected to get the answer - also missed the sneaky second solution to the last part
ah ok

lol i just made 2 equations for the lines using the points and did them that way, was easy enough
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dominicwild
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#1897
(Original post by MrBowcat)
One would think that the difficulty of a paper can only be assessed once the paper has actually been seen.
We work this out, as it's directly proportional to the amount of Hitler videos made.
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suyoof123
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#1898
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#1898
(Original post by Gome44)
That means there's a high probability of it coming up this year. You'll probably just be asked to sketch the graph and maybe use transformations with them
Thanks, I'll be sure to learn them in case.

(Original post by WillGood)
Guys i am going to share with you identies that you must know that are not included in the book

Take ∞ as Theta

Sin(90 - ∞) = cos(∞)
Cos(90 - ∞) = sin(∞)

Here are the practice Questions that envolve these identities:

June 2014 Q7
June 2013 Q3

I found out about these today from teacher. Have fun, sorry for the last minute notice but I hope I helps.
2014 Q7, how would you apply those two rules.
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nbofni
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#1899
(Original post by H0PEL3SS)
If you think that was bad, take a look at June 2013. It was 69 for the 100 IIRC..
I think the more crazy thing about that paper, was 50/75 for an A....
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Gilo98
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#1900
(Original post by BBeyond)
ah ok

lol i just made 2 equations for the lines using the points and did them that way, was easy enough
tbd sounds easier than the intended method
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