诚心求教数学,希望帮帮忙~~1.已知α、β属于(3π/4,π),sin(α+β)=-3/5,sin(β-π/4)=12/13,则cos(α+π/4)等于()A.16/65 B.56/65 C.-16/65 D.56/652.已知α,β属于(0,π),tan(α-β)=1/2,tanβ=-1

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