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和差化積口訣是什麼意思啊
和差化積口訣是什麼意思啊
更新时间:2025-11-18 04:02:38

  1、和差化積公式口訣:

  正弦+正弦,正弦在前;

  正弦-正弦,正弦在後;

  餘弦+餘弦,餘弦并肩;

  餘弦-餘弦,餘弦靠邊。

  2、積化和差公式:

  sinα·cosβ=(1/2)[sin(α+β)+sin(α-β)]

  cosα·sinβ=(1/2)[sin(α+β)-sin(α-β)]

  cosα·cosβ=(1/2)[cos(α+β)+cos(α-β)]

  sinα·sinβ=-(1/2)[cos(α+β)-cos(α-β)]

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