已知cos(π/6+α)=√3/3,则cos(5π/6-α)的值为 ( )

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已知cos(π/6+α)=√3/3,则cos(5π/6-α)的值为()已知cos(π/6+α)=√3/3,则cos(5π/6-α)的值为()已知cos(π/6+α)=√3/3,则cos(5π/6-α)

已知cos(π/6+α)=√3/3,则cos(5π/6-α)的值为 ( )
已知cos(π/6+α)=√3/3,则cos(5π/6-α)的值为 ( )

已知cos(π/6+α)=√3/3,则cos(5π/6-α)的值为 ( )
cos（5π/6-a)＝cos(a-5π/6）=cos(a+6/π-π）=负3分之根号3 很高兴为您回答题目.祝您天天好心情.