COS1=-COS179
COS2=-COS178
COS89=-COS91
所以原式=cos90+cos180=-1
cos1＋cos2＋cos3＋.＋cos180的值
cos1＋cos2＋cos3＋.＋cos180的值
一道填空題最好告訴我怎樣處理這一類型問題,
一道填空題最好告訴我怎樣處理這一類型問題,
其他人氣：121 ℃時間：2020-02-01 09:27:16
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