Differentiation using 1st Principle

Question 1

What are the key points in differentiaing from 1st principle?

Answer 1

1) FORMULA
Remember to check in the formula booklet for the formula for differentiation from first principles.

2) lim 
h => 0
In every step of your answer, you should write 
lim
h=>0.

3)SUBSTITUTE
Substitute f(x) into the equation, and f(x+a)

4)EXPAND and SIMPLIFY
After you have done this cancel with h on the denominator

5) AS h=>0 …
Make h=0 (DO NOT write this).
Write AS h=>0