IB DP Maths: AI HL复习笔记3.4.2 Simple Identities
Simple Identities What is a trigonometric identity? They are used to help simplify trigonometric equations before solving them Sometimes you may see identities written with the symbol ≡ This means ...
IB DP Maths: AI HL复习笔记3.4.1 The Unit Circle
Defining Sin, Cos and Tan What is the unit circle? The unit circle is a circle with radius 1 and centre (0, 0) Angles are always measured from the positive x-axis and turn: anticlockwise for positi...
周杰伦《最伟大的作品》霸屏！致敬艺术探索人文情怀，国际写作竞赛了解一下！
被“催更”6年 周杰伦的歌迷们终于迎来了“新春” 新专辑《最伟大的作品》先行曲MV上线 短短1小时点赞量突破百万 上线8小时播放量突破1.5亿 微博文娱榜更是占据半壁江山 01致 敬 —— 传 世 的Locations、不 朽 的Mast...
IB DP Maths: AI HL复习笔记3.3.3 Applications of Trigonometry & Pythagoras
Bearings What are bearings? Bearings are a way of describing and using directions as angles They are specifically defined for use in navigation because they give a precise location and/or direction...
IB DP Maths: AI HL复习笔记3.3.2 Non Right-Angled Trigonometry
Sine Rule What is the sine rule? The sine rule allows us to find missing side lengths or angles in non-right-angled triangles It states that for any triangle with angles A, B and C Where a is the s...
IB DP Maths: AI HL复习笔记3.3.1 Pythagoras & Right-Angled Triganometry
Pythagoras What is the Pythagorean theorem? Pythagoras’ theorem is a formula that works for right-angled triangles only It states that for any right-angled triangle, the square of the hypotenuse is...
IB DP Maths: AI HL复习笔记3.2.2 Volume & Surface Area
Volume of 3D Shapes What is volume? The volume of a 3D shape is a measure of how much 3D space it takes up A 3D shape is also called a solid You need to be able to calculate the volume of a number ...
IB DP Maths: AI HL复习笔记3.2.1 3D Coordinate Geometry
3D Coordinate Geometry How does the 3D coordinate system work? In three-dimensional space we can label where any object is using the x-y-z coordinate system In the 3D cartesian system, the x- and y...
IB DP Maths: AI HL复习笔记3.1.3 Arcs & Sectors
Length of an Arc What is an arc? An arc is a part of the circumference of a circle It is easiest to think of it as the crust of a single slice of pizza The length of an arc depends of the size of t...
IB DP Maths: AI HL复习笔记3.1.2 Radian Measure
Radian Measure What are radians? Radians are an alternative to degrees for measuring angles 1 radian is the angle in a sector of radius 1 and arc length 1 A circle with radius 1 is called a unit ci...
IB DP Maths: AI HL复习笔记3.1.1 Coordinate Geometry
Basic Coordinate Geometry What are cartesian coordinates? Cartesian coordinates are basically the x-y coordinate system They allow us to label where things are in a two-dimensional plane In the 2D ...
美国社会学专业好的大学有哪些推荐？
社会学是从社会整体出发，通过社会关系和社会行为来研究社会的结构、功能、发生、发展规律的综合性学科。社会学最初是由人类学演变而来，涉及到和人有关的所有相关的交叉性较强的学科。美国的社会学范围比较广，...
