WJEC AS Mathematics Integration
Section 1: Introduction to integration
Crucial points
1. Don’t muddle up the formulae for differentiation and integration
dy
Example: Given that x3 , find y
dx I’m being asked to differentiate
dy
Wrong
dx
x3 y 3x 2
3
The derivative of y is x , so
dy x4 to find y I need to integrate
Right
dx
x3 y c
4
2. Remember the arbitrary constant c
Always remember to put in the arbitrary constant – you will lose marks in
an examination if you miss it out!
1 of 1 13/05/16 © MEI
integralmaths.org
Section 1: Introduction to integration
Crucial points
1. Don’t muddle up the formulae for differentiation and integration
dy
Example: Given that x3 , find y
dx I’m being asked to differentiate
dy
Wrong
dx
x3 y 3x 2
3
The derivative of y is x , so
dy x4 to find y I need to integrate
Right
dx
x3 y c
4
2. Remember the arbitrary constant c
Always remember to put in the arbitrary constant – you will lose marks in
an examination if you miss it out!
1 of 1 13/05/16 © MEI
integralmaths.org
