积化和差公式8个公式,积化和差24字口诀

ˋ＾ˊ 积化和差公式：sinαsinβ=-[cos(α+β)-cos(α-β)]/2 cosαcosβ=[cos(α+β)+cos(α-β)]/2 sinαcosβ=[sin(α+β)+sin(α-β)]/2 cosαsinβ=[sin(α+β)-sin(α-β)]/2 积化和差公式：sinαsinβ=-[cos(α+β)-cos(α-β)]，cosαcosβ=[cos(α+β)+cos(α-β)]，sinαcosβ=[sin(α+β)+sin(α-β)]，cosαsinβ=[sin(α+β)-sin(α-β)]，和差化积

1、积化和差公式：sinαsinβ=-[cos(α+β)-cos(α-β)] cosαcosβ=[cos(α+β)+cos(α-β)] sinαcosβ=[sin(α+β)+sin(α-β)] cosαsinβ=[sin(α+β)-sin(α-β)] 积化积化和差公式：sinαbaisinβ=-[cos(α+β)-cos(α-β)]/2,cosαcosβ=[cos(α+β)+cos(α-β)]/2,sinαcosβ=[sin(α+β)+sin(α-β)]/2,cosαsinβ=[sin(α+β)-sin(α-β)]/2。和

积化和差公式八个口诀积化和差公式的口诀：1. 正弦加正弦，正加正；余弦加余弦，余加余；符号看象限，同号异名一加一。2. 正弦加余弦，正减余；余弦加正弦，余减正；符号看象限，同名1、积化和差sina*cosb=(sin(a+b)+sin(a-b))/2 cosa*sinb=(sin(a+b)-sin(a-b))/2 cosa*cosb=(cos(a+b)+cos(a-b))/2 sina*sinb=-(cos(a+b)-cos(a-b))/2 2、和差化积sinx+siny=2sin

积化和差公式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+(x-y)/2]；2.三角函数的积化和差公式（4个）sinxcosy=(1/2)[sin(x+y)+sin(x-y)]；cosxsiny=(1/2)[sin(x+y)-sin(x-y)]；cosxcosy=(1/2)[cos(x+y)+cos(x-y)]；sinxsiny=-(1/2)[cos(x+