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an=(n/2)*|cos(nπ/2)| 你可以根據這個寫出類似的 比如an=(n/2)*cos²;(nπ/2)
解析:∵奇數項=0,偶數項=1 ∴通項公式an=[1+(-1)^n]/2,n∈N* 也可以表達其他例如 an=│cos(nπ/2)│
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