若sin(π/6-α)=根号3/3,则,sin(7π/6-α)=

题目

若sin(π/6-α)=根号3/3,则,sin(7π/6-α)=

答案

sin(7π/6-α)
=sin(π+π/6-α)
=-sin(π/6-α)
=-√3/3