sin5π/6=1/2?
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sin5π/6=1/2?sin5π/6=1/2?sin5π/6=1/2?sin5π/6=1/2对.sin5π/6=1/2=sinπ/6sin5π/6=sin(π-π/6)=sinπ/6=1/2
sin5π/6=1/2?
sin5π/6=1/2?
sin5π/6=1/2?
sin5π/6=1/2
对.
sin5π/6=1/2=sinπ/6
sin5π/6=sin(π-π/6)=sinπ/6=1/2