1.(1) cos(3π/2-α)=cos(3π/2)cosα+sin(3π/2)sinα= -sinα(2)sin(3π/2-α)=sin(3π/2)cosα-cos(3π/2）sinα=-cosα(3)cos（π-α）=cosπcosα+sinπsinα= -cosα（4）sin（π-α）=sinπcosα-cosπsinα=...