並前往https://ocw.nthu.edu.tw/ocw/upload/269/news/10820%E6%9E%97%E7%A7%80%E8%B1%AA%E6%95%99%E6%8E%88%E6%87%89%E7%94%A8%E6%95%B8%E5%AD%B8%E5%85%A5%E9%96%80%E7%AD%86%E8%A8%98_P1-partial-derivative.pdf
