[James A]

(Original post by This Honest)
How do you integrate (1+2x)^-2

I did it and got -(1+2x)^-1
you wouldn't multiply the -1 by 2 coz that's the chain rule

You have to use a special method.

Basically you add one to the power of your integral and differentiate

In your case :

(1+2x)^-1 now differentiate this and see what number you get outside the bracket...

d/dx (1+2x)^-1


= -2(1+2x)^-2

now you need to multiply the number outside the bracket by another number to give you '1'

so we would have to multiply it by -1/2

so you would get

-1/2 (1+2x)^-1

It's worth remembering that integration is the opposite of differentiation.

If you see brackets with a power, when you integrate the expression, the power increases by 1.

[ezioaudi77]

Grade boundary for A*(i.e. 90/100 UMS) had never higher than 72/75 for any maths module. In order to maximise your chances of getting an A*, you have to make sure you lose no more than 6 marks total in C3 and C4.

[This Honest]

(Original post by James A)
You have to use a special method.

Basically you add one to the power of your integral and differentiate

In your case :

(1+2x)^-1 now differentiate this and see what number you get outside the bracket...

d/dx (1+2x)^-1


= -2(1+2x)^-2

now you need to multiply the number outside the bracket by another number to give you '1'

so we would have to multiply it by -1/2

so you would get

-1/2 (1+2x)^-1

It's worth remembering that integration is the opposite of differentiation.

If you see brackets with a power, when you integrate the expression, the power increases by 1.

Yes yes yes
Cheers buddy!

[shahruk]

(Original post by MustyQ)
how does cosec^2xtan^2x = sec^2x :s

Cosec(X) = 1/sin(X)

Tan (X) = Sin(X)/Cos(X)

=> Cosec(X) x Tan(X) = 1/cos(x) = Sec(X)

I left out the '^2' because it made the writing clumsy

[James A]

(Original post by ezioaudi77)
Grade boundary for A*(i.e. 90/100 UMS) had never higher than 72/75 for any maths module. In order to maximise your chances of getting an A*, you have to make sure you lose no more than 6 marks total in C3 and C4.

fml i thought the most marks you could loose would be like 8 but dang, i need to be spotless.........

[browb003]

Hi everyone, here are booklets with past paper questions from Core 4 papers if you want to revise certain topics

[MustyQ]

(Original post by shahruk)
Cosec(X) = 1/sin(X)

Tan (X) = Sin(X)/Cos(X)

=> Cosec(X) x Tan(X) = 1/cos(x) = Sec(X)

I left out the '^2' because it made the writing clumsy

cheeers pal i got there in the end but thanks

[browb003]

(Original post by browb003)
Hi everyone, here are booklets with past paper questions from Core 4 papers if you want to revise certain topics

2nd lot

[MustyQ]

(Original post by browb003)
Hi everyone, here are booklets with past paper questions from Core 4 papers if you want to revise certain topics

you are a sikk sikkk guyyyy!!!!! that means good btw

[ezioaudi77]

(Original post by browb003)
Hi everyone, here are booklets with past paper questions from Core 4 papers if you want to revise certain topics

Always wanted the questions chapter sorted, thanks for posting these. Rep given

Btw, do you have these for C3 as well?

[browb003]

(Original post by ezioaudi77)
Always wanted the questions chapter sorted, thanks for posting these. Rep given

Btw, do you have these for C3 as well?

Yup, I've posted them in this thread

http://www.thestudentroom.co.uk/show....php?t=1481747

and now I've uploaded them to the C3 revision thread

[john_bishop1]

(Original post by browb003)
2nd lot

Amazing, thanks! Time to try to understand vectors then!

[ezioaudi77]

(Original post by browb003)
Yup, I've posted them in this thread

http://www.thestudentroom.co.uk/show....php?t=1481747

and now I've uploaded them to the C3 revision thread

Thank you

[Callidus]

(Original post by browb003)
2nd lot

Thanks a lot

You don't by any chance have a list of all the trig identities?? Would be really helpful

[godknows]

(Original post by browb003)
Hi everyone, here are booklets with past paper questions from Core 4 papers if you want to revise certain topics

thank you so much

[master_blaster66]

has anyone got the new edexcel c4 book..i need help on ex 6F question 3c
help would be really appreciated

[geditor]

I have a feeling that an integration questions will come up that will absolutely bullock me!

[browb003]

(Original post by master_blaster66)
has anyone got the new edexcel c4 book..i need help on ex 6F question 3c
help would be really appreciated

Here's the solution from the CD, I hope it's the same book ha.
What part are you stuck on?

[master_blaster66]

(Original post by browb003)
Here's the solution from the CD, I hope it's the same book ha.
What part are you stuck on?

i got to the 5th line of this solution, but i dont know where you get the 2 from in the 6th line

[King_Arthur]

(Original post by master_blaster66)
has anyone got the new edexcel c4 book..i need help on ex 6f question 3c
help would be really appreciated

cant you give the question