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錯誤(cuo wu)原因:想復雜了,用了積化和差,cos裏分子有理化後誤以(wu yi)為分子為1(做過的很多題的確(ti di que)如此,所以沒仔細驗證) 錯誤(cuo wu)原因:方程組抄錯(或者說我寫的時候working memory記錯),把f'(2a)=f'(...