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# Official Edexcel C3 Discussion Thread watch

1. how do you work out the range and domain of a function
it always comes up in c3
its worth like 1 or 2 marks normally but i never get it :/
2. (Original post by maths-mental)
how do you work out the range and domain of a function
it always comes up in c3
its worth like 1 or 2 marks normally but i never get it :/
I always get confused with these yet in seems so simple.
Well the domain is the values which x takes and the range is the y values.
If you know the domain/range for a function e.g. f(x) then the domain/range of f-1(x) is just the opposite way round..i think.
xxx
3. Can someone show me the step-by-step differentiation of this:

Thanks!
4. I think its

5. According to the markscheme, the answer is:

Dunno where the came from.
6. (Original post by Doughboy)
According to the markscheme, the answer is:

Dunno where the came from.
you take the derivative of x which is 1 than divide the derivative of the function by the function, and if there is a constant you just multiply.

generally if you have a expression like this; than the derivative is

k is the constant. so they took the derivative of x, than divided it by x and the constant was 1/2 which they just left at the bottom, instead of leaving it multiplied by 1/2
7. Wait of course the derivative is 1/x not lnx :P
8. Oh, wait. I was over-thinking this one!
I just had to multiply by
9. (Original post by unknownking321)
can someone please help me. i'm looking for a song that has 'lalala' repeated in it and has lots of clapping. its quite catchy and sounds similar to something that the ting tings would release.
Just a guess, it's not Brick By Boring Brick by Paramore is it?
10. over the past 2 or 3 weeks a new advert for sky HD has come up, it is pritty much the same as the last advert they had but with different music. I am trying to find out the name of the music or the person who created it. Tar
11. "Another Sky HD ad, this one promoting the £49 Sky+ HD box. The track is SRXT by Bloc Party, from the 2007 A Weekend In The City CD."
12. (Original post by SirRamAlot)
"Another Sky HD ad, this one promoting the £49 Sky+ HD box. The track is SRXT by Bloc Party, from the 2007 A Weekend In The City CD."
That's not the track, it's from a newer advert they have been airing recentlly
13. Ohh, I probably haven't seen it.
14. (Original post by SFsucks)
over the past 2 or 3 weeks a new advert for sky HD has come up, it is pritty much the same as the last advert they had but with different music. I am trying to find out the name of the music or the person who created it. Tar
15. (Original post by SFsucks)
That's not the track, it's from a newer advert they have been airing recentlly
Oh actually what about "The Yeah Yeah Yeahs - Runaway"?
16. U guys there is a question in the exam style paper in the Edexcel book page 140 in old book, question 6b.....can any one answers this for me .....(tanp=-2)
i differentiated the equation

The Question States:
The Curve C has equation y=tanx + lnsecx (-pie/2<x<0)
At point P on C, Whose X coordinate is P, The gradient is 3

B) Show that tanp=-2

thanks
U guys there is a question in the exam style paper in the Edexcel book page 140 in old book, question 6b.....can any one answers this for me .....(tanp=-2)
i differentiated the equation

The Question States:
The Curve C has equation y=tanx + lnsecx (-pie/2<x<0)
At point P on C, Whose X coordinate is P, The gradient is 3

B) Show that tanp=-2

thanks
At the point P, dy/dx = 3, so make your differntiated equation equal to 3, and sub in x =p , into it and simplify, rearrange to get tanp=-2.
18. (Original post by FOBfan_xxo)
Am just guessing here... backstreet boys - bigger?
lol thanks for trying but no
19. i'm also doing this paper.
has anyone done any Solomon's? is it worth it?
20. I just did the Jun 09 paper, it's quite easy!

edit: there used to be a question here, but it was stupid, and I got the answer.

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