数学

[Udemy] 成为代数大师 | Become an Algebra Master

[Udemy]成为三角学和微积分大师 | Become a Trigonometry & Precalculus Master

[Udemy]密码学中的数学与James Grime博士 | The Mathematics of Cryptography with Dr James Grime

[Coursera]工程师数学专项课程 | Mathematics for Engineers Specialization

[Udemy]数学魔法师的三角学 1 | Trigonometry 1 with The Math Sorcerer