化简sin^2(α-π/6)+sin^2(α+π/6)-sin^2α
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化简sin^2(α-π/6)+sin^2(α+π/6)-sin^2α
sin^2(α-π/6)+sin^2(α+π/6)-sin^2α=1/2{1-cos(2α-π/3)+1-cos(2α+π/3)-1+cos2α}=1/2{1+cos2α-2cos2αcosπ/3}=1/2{1+cos2α-cos2α}=1/2
化简sin(α+β)+sin(α-β)+2sinαsin(3π/2-β)=
化简sin^2(α-π/6)+sin^2(α+π/6)-sin^2α
求值sin^2(α-π/6)+sin^2(α+π/6)-sin^2α
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