Basic elementary function

1. y = c (Constant function)
2. y = xⁿ (Power function) x to n,nth root of x;
3. y = sinx (Trigonometric functions)
4. y = sin^-1x
5. y = e^x
6. y = lnx

Definition1.1

1. Mapping映射
2. Independent variable自变量
3. Rectangular coordinate直角坐标系
4. Scatter plot散点图
5. Explicit function显函数
6. Piecewise-defined functions分段函数
7. Integer function -> int()
8. Monotonic单调的,monotonicity单调性
9. non-decreasing单调第三或不增不减