a)cos(α+β)+2sinαsinβ=
=cosαcosβ-sinαsinβ+2sinαsinβ=cosαcosβ+sinαsinβ=
=cos(α-β)=cosπ=-1;
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a)cos(α+β)+2sinαsinβ=
=cosαcosβ-sinαsinβ+2sinαsinβ=cosαcosβ+sinαsinβ=
=cos(α-β)=cosπ=-1;