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# P1 Revision topic - 1:15pm 9th June - Edexcel watch

1. (Original post by SkylineGTR)
do we need to know algebraic division? i don't remeber needing it any paper i've done recently
yes we do.
2. (Original post by mik1a)
na. Don't do d^3y/dx^3. Point of inflection is when the gradient (dy/dx) = 0 and the change in gradient (d²y/dx²) = 0 as well.

exactly therefore no point in d^3 it
3. ok thanks. i think i know it anyway...
4. ok guys do any of you use these equations to work out the trig equations:

cos x = +/- PV +360N
sinx = PV +180n
Tanx = (-1)^n PV + 180n
5. (Original post by TheWolf)
ok guys do any of you use these equations to work out the trig equations:

cos x = +/- PV +360N
sinx = PV +180n
Tanx = (-1)^n PV + 180n
nope! lol.. wtfa are they? looks remotely like pressure laws!
6. wow never seen them before...

i use:

Sin X = X1 + 360n AND Sin X = (180 - X1) + 360n
Cos X = + X1 + 360n
Tan X = X1 + 180n

X1 is the calculator value...
7. Wait I found out for sure what a point of inflection is:

"the condition for a point of inflexion is the f'(x)=0, f''(x)=o but f'''!=0"

This was in the heinmann textbook p141.

So we do need to know it if you do edexcel.
8. (Original post by Bebop)
Wait I found out for sure what a point of inflection is:

"the condition for a point of inflexion is the f'(x)=0, f''(x)=o but f'''!=0"

This was in the heinmann textbook p141.

So we do need to know it if you do edexcel.
Hmm. It's meant to be f'''(x) =/= 0 I think, but I guess you're right. Not too hard to rember.
9. (Original post by mik1a)
nope! lol.. wtfa are they? looks remotely like pressure laws!
its incredibly useful + quick to do no more cast diagrams
10. (Original post by SkylineGTR)
wow never seen them before...

i use:

Sin X = X1 + 360n AND Sin X = (180 - X1) + 360n
Cos X = + X1 + 360n
Tan X = X1 + 180n

X1 is the calculator value...
thats the same as mine! basically with PV being the caluclator value
11. (Original post by TheWolf)
thats the same as mine! basically with PV being the caluclator value
your sine and cos ones look different to me!
12. (Original post by SkylineGTR)
your sine and cos ones look different to me!
cos is the same! sine is different but im sure both works - mine definitely
13. sorry, i meant tan instead of cos

what do you mean by (-1)^n PV + 180n -1 to the n?
14. (Original post by mik1a)
Hmm. It's meant to be f'''(x) =/= 0 I think, but I guess you're right. Not too hard to rember.
f'''(x) =/= 0

He wrote:
f'''(x) != 0

It's the same thing.
15. (Original post by SkylineGTR)
sorry, i meant tan instead of cos

what do you mean by (-1)^n PV + 180n -1 to the n?
yes -1 to the n makes it positive or negative
16. Can anyone help with either of these differentiation questions?
Attached Images

17. guys we need to know the proof for quadratic formula which one is it?
18. (Original post by TheWolf)
guys we need to know the proof for quadratic formula which one is it?
Which one is what? The quadratic formula?

x = (-b ± √b² - 4ac)/2a

Edit: I see what you mean now and I don't know the answer. Sorry.
19. (Original post by RDoh)
Can anyone help with either of these differentiation questions?
i think for first one you differentiate and find minimum maximum points then draw curve
20. are proof of quadratic formula and a.p /g.p the only ones we need to know?
I don't know which proof for quadratic formula it is though

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