[數撚圍爐區] Most mathematicians are bipolar disorders... (8)

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solve ode 要用到method of undetermined coefficient.咁其實點解要去估個undetermined coefficient?

eg:
y"+2y'=cos(3t)
點解要guess y(t)=A*cos(3t)+B*sin(3t)?
final yr都唔知點解,只係識操數
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