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

1. (Original post by mik1a)

Bascally, you are given two variables (but not explicitly told). These can be likened to x and y. You are given enough constraints to write one in terms of the other. You may need to do some substituting.

Once you have them in the form:
eg.
y = x^2 + x + 1

And you have to "find the value of x for which y is minimum", differentiate and set equal to zero:

dy/dx = 2x + 1 = 0
2x = -1
x = -1/2

So this is the value when y is a minimum. Sorry I'm rushed, gtg, I'll explain in mroe detail later, or maybe someone else will beat me to it. These are typical applications of calculus questions.
thanks for your help. much appreciated. look foward to hearing from you later
2. u guys dont need to work so hard for the P1 exam u konw
3. (Original post by z!D4N)
u guys dont need to work so hard for the P1 exam u konw
i do, i dont think i can get higher than 50 let along 65
4. (Original post by chats)
i do, i dont think i can get higher than 50 let along 65
work harder then
5. How many proofs do you have to learn off by heart, and which ones?
6. Have you gotta be able to prove, for example, that sin^2x + cos^2x = 1?
How many proofs do you have to learn off by heart, and which ones?
geometric +arthimetic
Have you gotta be able to prove, for example, that sin^2x + cos^2x = 1?
yes
the sin&cos identity is in the syllabus
9. (Original post by z!D4N)
yes
the sin&cos identity is in the syllabus
it's in the syllabus, but you don't have to know how to prove it
10. (Original post by mockel)
it's in the syllabus, but you don't have to know how to prove it
duh
11. (Original post by z!D4N)
work harder then
stop saying you dont have to workk hard then!
12. (Original post by z!D4N)
duh

first:
Have you gotta be able to prove, for example, that sin^2x + cos^2x = 1?
then you replied:
(Original post by z!D4N)
yes...
so i said you don't have to know how to prove it, and you come out with that???
13. he is just a moron, just caus he THINKS he knows it all and i bet he dont

edit: in fact i feel like giving out my 32 point bad rep *crack knuckles*
14. So, you've got to know how to prove:

Arithemtic - Sum, nth Term and first n natural numbers.

And Geometric - Sum, nth Term and sum to infinity.

That right?
15. (Original post by mockel)

first:

then you replied:

so i said you don't have to know how to prove it, and you come out with that???
if u didnt understand, read again carefully. XD~~
16. (Original post by chats)
he is just a moron, just caus he THINKS he knows it all and i bet he dont

edit: in fact i feel like giving out my 32 point bad rep *crack knuckles*
sure, im willing to receive it
17. (Original post by chats)
he is just a moron, just caus he THINKS he knows it all and i bet he dont

edit: in fact i feel like giving out my 32 point bad rep *crack knuckles*
dude, give it now man
18. (Original post by z!D4N)
dude, give it now man
you will recieve when the time is right
19. (Original post by z!D4N)
dude, give it now man
****
20. (Original post by chats)
you will recieve when the time is right
when? i dont believe u, coward.

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