[Smith987]

(Original post by xReenax)
Is anyone doing the new spec...it feels like im the only one in the world doing it

Don't think so :P http://www.thestudentroom.co.uk/showthread.php?t=914512

[Zygroth]

(Original post by romski)
or 1/(3+5cos*2) ,<-- in this case you will use tanx=t

1/(3+5cos) <,-- in this case you will use tanx/2=t

Why? What's the difference?

[Smith987]

Its to do with getting rid of the square roots in the equation which makes the substitution so easy.

[SimonM]

(Original post by Smith987)
we dont have to use the substitution t=tanx do we?!

If they do ask us, will they tell us "use the substitution..." or do they assume we know it? I'm concerned now :'(

I think you can be fairly confident that they will tell you

[Zygroth]

Hmm am I right in saying that if you use tan x = t, then:

and

[SimonM]

(Original post by Zygroth)
Hmm am I right in saying that if you use tan x = t, then:

and

Yes.



So:

[Smith987]

think so.. and if you use tan(x/2), you end up getting cosx= blah blah, with roots involved, but then sinx = 2cos(x/2)sin(x/2) which gets rid of the roots problem, if that makes sense?

[Smith987]

(Original post by SimonM)
Yes.



So:

or just in terms of a triangle? the hypoteneuse would be sqrt(1+x^2) and x is the angle, easy to see.

[SimonM]

(Original post by Smith987)
think so.. and if you use tan(x/2), you end up getting cosx= blah blah, with roots involved, but then sinx = 2cos(x/2)sin(x/2) which gets rid of the roots problem, if that makes sense?

You mean

?

[Smith987]

Not exactly, I was trying to help out Zygroth, but I'm probs not making sense haha

[Zygroth]

Lol someone explained to me the tan x/2 = t one already. I had to look it up again though, cause it was ~2 weeks ago...Just goes to show that starting revision early does absolutely nothing

[Smith987]

Yup its all about the last minute cramming!!

[SimonM]

(Original post by Zygroth)
Lol someone explained to me the tan x/2 = t one already. I had to look it up again though, cause it was ~2 weeks ago...Just goes to show that starting revision early does absolutely nothing

Let , then



And use normal substitution.

[Smith987]

Does anyone have the June 08 mark scheme? its not on freeexampapers

[hamster123]

FP2%202008-06%20MS.pdf

[Smith987]

Thanks very much

[alexsheppard11]

(Original post by Smith987)
Does anyone have the June 08 mark scheme? its not on freeexampapers

it is

http://www.freeexampapers.com/FreeEx...0wNiBNUy5wZGY=

[Smith987]

Ooops :P totally missed that one hehe

[napanda]

oh my, not looking forward to this exam at all!! but it's my last

xx

[Zygroth]

Ugh, I'm really regretting my early revision. I have 2 papers left (for tomorrow). Dunno what to do now I can't do the Qs in the book lol My algebra manipulation isn't good enough for most of conic sections Anyone wanna teach me?