sin10°=cos80°
cos2β=cos²β-sin²β
Исправим ошибки у остальных
sin²(2α)=cos²(2α)=1
sin4α=2sin2αcos2α=4sinαcosα*cos2α
cos(-80°)=cos80°
cos(α-β)=cos(α)*cos(β)+sin(α)*sin(β)
sin(α+β)=sin(α)*cos(β)+sin(β)*cos(α)
sin10°≠sin(-10°), т.к. sin(-10°)=-sin10°
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Answers & Comments
sin10°=cos80°
cos2β=cos²β-sin²β
Исправим ошибки у остальных
sin²(2α)=cos²(2α)=1
sin4α=2sin2αcos2α=4sinαcosα*cos2α
cos(-80°)=cos80°
cos(α-β)=cos(α)*cos(β)+sin(α)*sin(β)
sin(α+β)=sin(α)*cos(β)+sin(β)*cos(α)
sin10°≠sin(-10°), т.к. sin(-10°)=-sin10°