A Level 9709: First principle | 现代数学启蒙

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Topic: First Principle in Mathematics （1）

The first principle in mathematics refers to the fundamental concept or rule that forms the basis of a mathematical theory or problem-solving approach. It serves as the starting point for understanding and applying mathematical principles.

Example:

To illustrate the first principle, let's consider the concept of differentiation in calculus. The first principle of differentiation, also known as the derivative, is used to find the rate of change of a function at a given point. By applying the first principle, we can determine the slope of a curve at any point.

Exercises:

Find the derivative of the function f(x) = 3x^2 - 2x + 1 using the first principle of differentiation.

Calculate the rate of change of the function g(t) = 4t^3 - 2t + 5 at t = 2 using the first principle.

Answers for the exercises above:

By applying the first principle of differentiation, we can find the derivative of f(x) = 3x^2 - 2x + 1 as follows:

Step 1: Take the limit as h approaches 0 of [f(x + h) - f(x)] / h.

Step 2: Substitute the given function into the formula and simplify.

Step 3: Evaluate the limit to find the derivative.

The derivative of f(x) = 3x^2 - 2x + 1 is 6x - 2.

To calculate the rate of change of g(t) = 4t^3 - 2t + 5 at t = 2 using the first principle, we follow a similar procedure as in the previous exercise. The derivative of g(t) is found to be 12t^2 - 2. Substituting t = 2 into the derivative, we get the rate of change as 44.

Other Resources:

For further understanding and practice on the first principle in mathematics, you may refer to the following resources:

Textbooks on calculus and mathematical analysis.

Online tutorials and video lectures on differentiation and its applications.

Mathematical problem-solving books with exercises and solutions.