which is “u” in intergration by parts
“ln” or “x^n”
area between these 2 bits of the curve?

use instinct here…. just get area under both cuves (in the reigon you want ) and then substract from each other!

area of R2?

area of y= sinx between 0 and pi/4 and then MULTIPLY BY 2
trapezium rule : finding height
h= b-a / n
use the diagram to explain why an increase in number of values would increase accuracy (trapezium rule )
dont forget this standard integral…

steps for differential equations ..
make dy the subject
intergrate
make y the subject