sin(a+π/3)=4/5,π/6

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sin(a+π/3)=4/5,π/6sin(a+π/3)=4/5,π/6sin(a+π/3)=4/5,π/6∵π/6

sin(a+π/3)=4/5,π/6
sin(a+π/3)=4/5,π/6

sin(a+π/3)=4/5,π/6
∵ π/6