sin(2π/3+θ)=3/5,则cos2θ=?

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sin(2π/3+θ)=3/5,则cos2θ=?
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sin(2π/3+θ)=3/5,则cos2θ=?
sin(2π/3+θ)=3/5,则cos2θ=?

sin(2π/3+θ)=3/5,则cos2θ=?




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