sin (11π/3)=sin(4π-π/3)=-(-sin π/3)怎么算的,sin (11π/3)=sin (12π-π)/3=sin(4π-π/3)=sin(-π/3)=-sin(π/3)；因此题中所说的：“sin11派/3=sin(4派-（派/3）)=-(-sin（派/3）)”是错的：应改成：“sin11...
