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和差化积公式速记口诀

更新时间： 2021-01-19 09:03:45

1、正加正，正在前：sin α+sinβ=2sin[(α+β)/2]·cos[(α-β)/2]

2、正减正，余在前：sin α-sin β=2cos[(α+β)/2]·sin[(α-β)/2]

3、余加余，余并肩：cos α+cos β=2cos[(α+β)/2]·cos[(α-β)/2]

4、余减余，余不见，负号很讨厌：cos α-cos β=-2sin[(α+β)/2]·sin[(α-β)/2]

关键词：公式速记口诀

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