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
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
Note: This article is starting in QQ space (because of the need to peer acquaintances to correct). Because of the closure of QQ, here to re-paste once. This address: http://blog.csdn.net/madongchunqiu/article/details/18614233Description: The
Description: The following text, gray for blowing hydrology, black for the body, blue for the use of the parameters in the actual application of the instructions.The cause is this. Time back to the end of 07, 4G Square Hing, next door next door
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
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
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
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