【好文转载】曲线的切向量怎么求？和平面法向量的联系

https://blog.csdn.net/Cake_C/article/details/107919007#:~:text=%E5%AF%B9%E5%87%BD%E6%95%B0%20y%3Dkx%20%E6%9D%A5%E8%AF%B4%EF%BC%8C%20dy%3Dkdx%20%E6%89%80%E4%BB%A5%E5%88%87%E5%90%91%E9%87%8F%E5%B0%B1%E6%98%AF%20%28dx%2C%20dy%29%20%3D,%2B%20b%29dx%20%E6%89%80%E4%BB%A5%E5%88%87%E5%90%91%E9%87%8F%E5%B0%B1%E6%98%AF%20%28dx%2C%20dy%29%20%3D%20%281%2C%20ax%2Bb%29