3.10 Vectors river crossing 过河问题
3.20 微积分入门：First Principle, chain rules
differentiation of logs
2.27无穷等比数列
Differetiation of trignometric functions 1-formulas
2.18视频课
Maclaurin Series
5.4SecondDerivatives
4.17MidtermChecklist
differentiation of exponential functions
Differetiation of trignometric functions 2-exercises
1.1答疑 radical functions 带根号的函数画图
5.6习题讲解
3.23 Product rule
3.17 Calculus First Principle
4.14recap_differentiate_exps_and_logs
Differetiation of trignometric functions 2-proof of formulas
4.14recap_circular_measure
3.26习题课
1.5答疑 圣诞作业讲解1
