AQA A Level Maths: Pure复习笔记7.1.2 First Principles Differentiation
First Principles Differentiation
What is the derivative or gradient function?
- For a curve y = f(x) there is an associated function called the derivative or gradient function
- The derivative of f(x) is written as f'(x) or
- The derivative is a formula that can be used to find the gradient of y = f(x) at any point, by substituting the x coordinate of the point into the formula
- The process of finding the derivative of a function is called differentiation
- We differentiate a function to find its derivative
What is differentiation from first principles?
- Differentiation from first principles uses the definition of the derivative of a function f(x)
- The definition is
How do I differentiate from first principles?
Exam Tip
- Most of the time you will not use first principles to find the derivative of a function (there are much quicker ways!). However, you can be asked on the exam to demonstrate differentiation from first principles.
- Make sure you can use first principles differentiation to find the derivatives of kx, kx2 and kx3 (where k is a constant).
Worked Example
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