sin(π+α)=-1/2,sin（π/2+α）=sin(π+α-π/2)=-cos(π+α)=±√3/2；cos（α-3π/2）=cos（α-3π/2+2π）=cos（α+π/2）=cos（α+π-π/2）=sin(π+α)=-1/2tan（π/2-α）=-tan（α-π/2）=-tan（α+π-π/2...