★【新教學影片】提要033:認識Euler-Cauchy方程式的解法(三)--複數根 (Solve x²y'' + xy' + 4y = 0, y(1) = 2, y'(1) = –1)

★【新教學影片】提要033:認識Euler-Cauchy方程式的解法(三)--複數根 (Solve x²y'' + xy' + 4y = 0, y(1) = 2, y'(1) = –1)