The Edexcel C4 (21/06/12 - PM) Revision Thread

$\displaystyle \int \ln x \ dx = \int 1 \times \ln x \ dx$

now integrate by parts using, $\displaystyle u = \ln x \ \ \ \ \ \frac{dv}{dx} = 1$

Does sin integrate to -cos?

Does sin integrate to -cos?

Does sin integrate to -cos?

But why and how does x= x+1-1?
Where did you get that info from

that's application skills and improvisation gained with experience

you add and subtract 1 to x this wont effect the outcome but it'l help u arrange the equation in a more user friendly way ( so u can maybe add and subtract 2 if the bottom term was (x + 2) )

What raw mark do I need to get 60ums?

What raw mark do I need to get 60ums?

Has anyone done Question 3 from the mock paper?

I don't understand how to simplify: 5ln(5/4) + 2ln(4/3) (The mark scheme gets this 5ln(5/4) + 2ln(4/3) and then they get this: 3ln(5/4) how do they get that?)

Can someone please explain this, thanks.

Here is the paper and mark scheme: