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C3 January 2013 25/01/2013

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Original post by As04
Anyone know the average grade boundaries for C3?


around 64ish for an A I think
Original post by posthumus
You mean double angle formula ?
I really don't think so.

but factor formulae proof may come up


omg can the proof for the addition formula be asked :P dont get all the triangle-arc nonense in the book :P
Original post by MedMed12
there was arcsinx stuff in june right?
hopefully that means none today xD


think it came up in january xD

but it was 2007 - I doubt it will come up again..
Original post by PoorLoser
think it came up in january xD

but it was 2007 - I doubt it will come up again..


there was a tiny bit in June wasnt there? :s-smilie: you know with the dx/dy question?
sorry it was another question which was similar
(edited 11 years ago)
Guys when it comes to the quotient rule and say v = (x+3)^6

What would v^2 be? What's the rule for doing a power of a power? Thanks


It would be (x+3)^12. You simply multiply the powers together :smile:
Original post by Samira123
No the actual addition formulae?


No way
Guys no way will they ask you to find proof of addition formula (I think anyway) :tongue:

If you lot are interested ....

Can differentiate cot(x) ... by making it equal to cos(x)/sin(x)

How about if I make it equal [tan(x)]^-1
and I differentiate that...

Also how would I differentiate cosec and sec ?? :smile:

Thanks in advance
Reply 1828
What kind of questions is everyone worried about the most?
Any last minute tips?

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I don't know why but I've woken up so nervous for this exam, even though I was feeling confident yesterday :frown:
Original post by Alex_1
What kind of questions is everyone worried about the most?
Any last minute tips?

Posted from TSR Mobile


I'm worried about those one mark domain and range questions :angry:
guys, question 4 on june 2011 why is the gradient of the normal -8 should it be -1/8 ? sorry blank moment
Original post by posthumus
Guys no way will they ask you to find proof of addition formula (I think anyway) :tongue:

If you lot are interested ....



haha yeah its in the box but I missed it out because it looked too effortly
They are in the formula book :smile:


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Original post by MedMed12
guys, question 4 on june 2011 why is the gradient of the normal -8 should it be -1/8 ? sorry blank moment


You sure you've given the right paper ?

Seems to be about functions this question
Original post by posthumus
You sure you've given the right paper ?

Seems to be about functions this question


sorry jan 2012 :P
just looking over some questions I did afew weeks ago and couldnt do and now see how easy they are
if this happens in the exam - massive *facepalm*
Original post by MedMed12
sorry jan 2012 :P


x= 2tan(y+pi/2)

dx/dy = 2sec^2(pi/3)

dx/dy = 8

dy/dx = 1/8

you want the normal... so negative reciprocal ... -8 :smile:
Reply 1838
Original post by posthumus
Can differentiate cot(x) ... by making it equal to cos(x)/sin(x)

How about if I make it equal [tan(x)]^-1
and I differentiate that...

Also how would I differentiate cosec and sec ?? :smile:

Thanks in advance


You can write them as 1/sine and 1/cos and use the quotent rule or however you spell it :smile:

They're also in the formula booklet.

Good luck all.
Original post by posthumus
x= 2tan(y+pi/2)

dx/dy = 2sec^2(pi/3)

dx/dy = 8

dy/dx = 1/8

you want the normal... so negative reciprocal ... -8 :smile:


stupid me, I didnt see it was dx/dy and I remember making that mistake last time
I see thank you!!! haha must drum this into my head to check :smile:

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