1. Coordinate system:Flash coordinate system and mathematical coordinate system: the X axis is the same, and the y axis is the opposite.[Mathematical coordinate system][Coordinate system in Flash]2. Conversion between Angle and Radian:(1) radians:

Name
Abs
Category
Mathematical functions
Prototype
Abs (number)
Parameters
Must be selected. The number argument is a valid numeric expression of any type
"Return value"
Type of same number
"Exception/Error"
No
Description
Returns the absolute value

Previously, I learned about matrices in linear algebra and had some knowledge about the basic operations of matrices. I learned how to use matrices to change images when I used GDI + some time ago, after reading this article, I will summarize it

Basic Relationship Between trigonometric functions of the same angle
Reciprocal Relationship:
Business Relationship:
Square relationship:
Tan α-cot α = 1Sin α-CSC α = 1Cos α-sec α

Matrix learning-Basic Knowledge
Previously, I learned about matrices in linear algebra and had some knowledge about the basic operations of matrices. I learned how to use matrices to change images when I used GDI + some time ago, after reading this

In the linear algebra before learning the matrix, there are some understanding of the basic operation of the Matrix, some time ago in the use of GDI + to learn how to use the matrix to change the image, after reading here to summarize the

Not to mention nonsense:
0. Overview-Demand Analysis-function description-restrictions and defects improvement + knowledge preparation
1. essential differences between Taylor series and Fourier series, Taylor's expansion
2. Function projection and

I've always wanted to write an article and talk to you: $$\frac{1}{1^2}+\frac{1}{2^2} +\frac{1}{3^2} +\frac{1}{4^2} +\frac{1}{5^2} +\cdots\ =\ \frac{π^2 }{6}$$ This article assumes that the reader loves mathematics and has mastered the high

This course (MOOCULUS-2 "sequences and Series") was taught by Ohio State University on the Coursera platform in 2014.PDF textbook Download sequences and SeriesThis series of learning notes PDF download (academia.edu) MOOCULUS-2 solutionSummary

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