Hiya.
Here are those details about addition formulae that you were after.
This first page uses a demo that you’ll need to download. Its free. The areas of the grey squares and rectangles match up giving the identity for sin(A+B)
This second one uses a different proof but it is just as lovely. It comes from the circle theorems – just look out for the right angled triangles inside the circle.
This third one is just like the proof I went thro in the lesson.
Hope that they help.
Mr Williams
heyy me n maeve did some stats today but struggled on a few questions so were wondering if our next stats lesson could b helping us with the stuff we got stuck on…
like deciles and percentiles and relative frequency histograms!
thanks
hope you are having a nice half term
talia and maeve
Hi Talia and Maeve,
Deciles and percentiles are just the same as quartiles apart from the size of the groupings.
Lower quartile, median and upper quartile group the data into quarters – hence the name! (Picture a box plot)
With deciles, the data is grouped in tenths, and with percentiles, hundredths. That’s all there is to it – persevere a bit longer and you’ll crack it, I’m sure.
Mrs T
TRIG
TRIG
pls explain qu2 of the c3 paper jan 2008..
Sorry Marsha, I don’t have the paper here. Is it possible to type it out? If not see one of us in school tomorrow.
JT
a curve C has the equation
y=e^2x tan x, x does not =(2n+1)(pi\2)
(a) show that the turning points on C occurs where tan x=-1
(b) find an equation of the tangent to C at the point where x=0
Turning points are max and min; gradient = 0 there.
a)Differentiate function to get dy/dx and set it = to 0.
b)Find value of gradient when x=0. Find y value when x=0 then sub these values into y-y1 = m(x-x1)
how do u differentiate y=e^2x tan x
It’s a product – use the product rule!
oh lol. is the differentiation of tan x -tan x?..
NOOOOOOOOOOO!
i don’t know how to differentiate that. is the differentiation of tan x zero
It’s called the derivative not the differentiation!
Look at Page 138 in C3
i didn’t receive any statistics practice papers
could someone please, out of the kindness of their heart, upload these papers. show kindness if any at christmas time.
Hi Marsha,
I gave them to Talia during period 2.
JT
You can also find a specimen paper on the edexcel website at
http://www.edexcel.com/quals/gce/gce-leg/maths/Pages/default.aspx
thank u miss, the website is so helpful as there are so many! :p
however. i need a username and password to download…
You can access the specimen paper and mark scheme without one.
we’re not getting a test for c3 and d1 2moro ar we? …..
Not D1 – I’ll have some questions for you to work through though.
JT
I’m not really too sure where to comment but hopefully someone will get this comment.
Mr Brewin or Mr Williams can you please put up under the password protected section all the past papers; c1,c2,c3,c4,d1, for all the year 13s revision.
This will be very helpful, thank you.
Frankie,
Are you retaking D1?
I’ve given a D1 paper to Maeve and Marsha today.
Tea Lady
No I’m not but people are.
I’m pretty sure everyone wants all of them up because that’s the best way we revise.
I think it will be easier if mr williams/brewin upload them here and us all pick and choose the ones we need to save the teachers having to print of lots of papers for each of us.
Frankie,
I AM doing something about this on Wednesday.
MW
thanks for the papers you have put up, can we please have mark schemes for them? and can we have even more papers, theyre the best way to revise.
thanks.
See other thread for pink paper answers.
You’ll need to wait for Mr W for the others as I don’t know how to password-protect them.
For more practice papers and mark schemes, have a look at the AQA website
http://www.aqa.org.uk/qual/gceasa/mathematics_assess.php
Hi i know people ahve already asked for the mark schemes for the past papers, but on the c1 paper Q2 it says:
factorise completely x^3-9x
is it x(x^2-9)
because it’s 3 marks and i thought that would be too easy?
Hi Claire,
That’s the first step. What you have in the bracket now is the difference of 2 squares.
Mrs T
oooohh yeah thanks, i thought it was a bit too easy. Also bit stuck on qu8
Given that the equation 2qx^2+qx-1=0, where q is a constant, has no real roots
a) show that q^2+8q<0
i just used b^2-4ac<0 if there are no real roots.
but part b) Hence find the set of possible values of q .
bit confused because we’ve got 2 unknowns???
Hi Claire,
Try sketching q^2 + 8q = 0
Factorise it first to see where the roots are. It’s a smiley parabola so you’ll be able to see where it’s below the axis ie < O
i still dont know where to comment on this thing, and i cant find where my last comment went
but can i please have the c4 answers to the practice papers!!