[理工] [工數]-拉式
清大電機第九題
http://www.lib.nthu.edu.tw/library/department/ref/exam/eecs/ee/93/932601.pdf
f(t)=u(t-6)(t^2 -3)
=u(t-6)(t-6)(t+0.5)-5.5t
這樣拆可嗎?? 做出來跟答案不同
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