建國中學 mathematica 入門
http://math1.ck.tp.edu.tw/%E6%95%B8%E5%AD%B8%E5%BB%BA%E6%A8%A1/Mathematica%E8%AC%9B%E7%BE%A9_33_%E6%A0%BC%E5%BC%8F17.pdf
https://www.wolfram.com/language/fast-introduction-for-math-students/en/trigonometry/
https://www.wolfram.com/wolfram-u/catalog/gen005/
https://pages.mtu.edu/~msgocken/pdebook2/mathtut2.pdf