冪次函數 f ( x ) = x n ,若 n = 0,2,4,6, 為偶數,則 f ( x )為偶函數,若 n = 1,3,5,7 ... an ⋅ cos x + b n ⋅ sin x ⎤ ⎥ ⎦ l l n = 1 ⎡ ⎢ ⎣ 1 ∫ l l 其中, ...
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