[工數] Variation of parameters
http://ppt.cc/Da1G
O'Neil 第六版 82 頁
解 Nonhomogeneous Yp 的推導過程
裡面如圖中紅框圈起來的
Simplify this derivative by imposing the condition that
u1'y1 + u2'y2 = 0
不太懂這條件為什麼會成立
請板上大大解惑 謝謝
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