1. 1 sine theorem and cosine theorem

Application example of 1.2

1.3 Practice homework

Chapter II Sequence of Numbers

2. The concept and simple representation of1sequence

2.2 arithmetic progression

2.3 arithmetic progression's top n sums

2.4 geometric series

2.5 the first n sums of geometric series

Chapter III Inequality

3. 1 inequality relation and inequality

3.2 One-variable quadratic inequality and its solution

3.3 Binary Linear Inequalities (Groups) and Simple Linear Programming

3.4 basic inequality: ab < = (a+b)/2 under the root