cos(2α+β)+2sin(α+β)sinα化简

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cos(2α+β)+2sin(α+β)sinα化简

cos(2α+β)+2sin(α+β)sinα化简
cos(2α+β)+2sin(α+β)sinα化简

cos(2α+β)+2sin(α+β)sinα化简
cosβ
过程
=cos2acosb -sin2asinb + 2sina^2cosb +2sinbsinacosa
=cosa^2cosb +sina^2cosb
=cosb

cos(2α+β)+2sin(α+β)sinα
=cos2αcosβ-sin2αsinβ+2sinα(sinαcosβ+sinβcosα)
=cos2αcosβ-sin2αsinβ+2sinαsinαcosβ+2sinαsinβcosα
=cos2αcosβ-sin2αsinβ+2sinαsinαcosβ+sin2α sinβ
=cos2αcosβ+2sinαsin...

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cos(2α+β)+2sin(α+β)sinα
=cos2αcosβ-sin2αsinβ+2sinα(sinαcosβ+sinβcosα)
=cos2αcosβ-sin2αsinβ+2sinαsinαcosβ+2sinαsinβcosα
=cos2αcosβ-sin2αsinβ+2sinαsinαcosβ+sin2α sinβ
=cos2αcosβ+2sinαsinαcosβ
=(cos2α+2sinαsinα)cosβ
=(cos2α+2sin²α)cosβ
=cosβ(1-2sin²α+2sin²α)
=cosβ

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