(1)  sin2θ-sinθ=0
sinθ(2cosθ−1)=0
sinθ=0、cosθ=1/2
θ=nπ、π/3+2nπ、5π/3 +2nπ

(2)  sinθ-√3cosθ=1
2sin(θ-π/3)=1
sin(θ-π/3)=1/2
θ-π/3=±π/6+2nπ