sin(-α)=-sinα
sin(π/2-α)=cosα
sin(π/2+α)=cosα
sin(π-α)=sinα
sin(π+α)=-sinα
sin(3π/2-α)=-cosα
sin(3π/2+α)=-cosα
sin(2π-α)=-sinα
sin(2kπ+α)=sinα
sinθ+sinφ=2sin[(θ+φ)/2]cos[(θ-φ)/2]
sinθ-sinφ=2cos[(θ+φ)/2]sin[(θ-φ)/2]
cosθ+cosφ=2cos[(θ+φ)/2]cos[(θ-φ)/2]
cosθ-cosφ=-2sin[(θ+φ)/2]sin[(θ-φ)/2]
sin0°=0
sin30°=0.5
sin45°=根号2/2
sin60°=根号3/2
sin90°=1
sin120°=0.5
sin135°=根号2/2
sin150°=根号3/2
sin180°=0