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sin(α+π/3)+sinα=-4√3/5
sin(π-α)等于3/5
sin(θ+π/3)
sin(α+π/4)=1/3,求sin2α
sin(α+β)=5/13
sin(2nπ+2π/3)×cos(nπ+4π/3)
sin-19π/3
sin-4π/3
sin(π/3-α)=1/4,则cosπ/3+2α
sin(α-π/3)=1/3
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