[微積] 級數的問題
(k)
e^x ∞ f (0) (4)
f(x)= _________ = Σ _________ x^k for |x|<1 求 f (0) =?
1- x^2 k=0 k!
請問應該從哪個方向著手?
利用判斷是否收斂嗎?
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