若sin(π/10-a)=根号3/2,则sin(11π/10-a)=

Question

若sin(π/10-a)=根号3/2,则sin(11π/10-a)=

Answer 1

sin(11π/10-a)
= sin(π + π/10-a)
= -sin(π/10-a)
= -√3/2